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LearningAboutThePlanets

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What Exactly is a Planet?<br />

In our Solar System, a planet is definted as a celestial body which is<br />

in orbit around the Sun, has sufficient mass to assume hydrostatic<br />

equilibrium (a nearly round shape), has “cleared the neighborhood”<br />

around its orbit and is not a moon.<br />

There are actually three types of planets in our solar system - Terrestrial<br />

Planets, Gas Giant Planets, and Dwarf Planets. In this book<br />

we cover the Terrestrial Planets (Mercury, Venus, Earth, and Mars and<br />

the Gas Giant Planets (Jupiter, Saturn, Uranus and Neptune.) We do<br />

not cover the Dwarf Planets (currently known: Ceres, Pluto, Haumea,<br />

Makemake and Eris) simply because we do not have enough information<br />

about these planets which are farther away and more difficult<br />

to study!<br />

“The heavens declare the glory of God, and the sky above proclaims<br />

his handiwork.” Psalm 19:1


Facts About the Sun<br />

• The Sun’s diameter is 865,000 miles; that’s 109 times the diameter<br />

of the Earth.<br />

• Mass: 1.98892 x 1030 kg - That’s 333,000 times the mass of<br />

Earth.<br />

• Surface gravity of the Sun: 27.94 g - the gravity of the Sun at the<br />

surface is 28 times the gravity of the Earth.<br />

• Volume of the Sun: 1.412 x 1018 km3 - That means you could fit 1.3<br />

Million planets the size of the earth into the sun!<br />

• Density of the Sun: 1.622 x 105 kg/m3<br />

• Everything in the Solar System orbits around the Sun, including 8<br />

planets and their moons, many dwarf planets, asteroids, comets<br />

and dust.


Fill-In-The Blank Facts About the Sun<br />

• The Sun’s diameter is 865,000 miles; that’s ____________ the<br />

diameter of the Earth.<br />

• Mass: 1.98892 x 1030 kg - That’s ______________ the mass of<br />

Earth.<br />

• Surface gravity of the Sun: 27.94 g - the gravity of the Sun at the<br />

surface is ____________ the gravity of the Earth.<br />

• Volume of the Sun: 1.412 x 1018 km3 - That means you could fit 1.3<br />

Million planets the ___________________ into the sun!<br />

• Density of the Sun: 1.622 x 105 kg/m3<br />

• Everything in the _______________ orbits around the Sun, including<br />

8 planets and their moons, many dwarf planets, asteroids,<br />

comets and dust.


Fill-In-The Blank Facts About the Sun<br />

• The Sun’s diameter is 865,000 miles; that’s ____________ the<br />

diameter of the Earth.<br />

• Mass: 1.98892 x 1030 kg - That’s ______________ the mass of<br />

Earth.<br />

• Surface gravity of the Sun: 27.94 g - the gravity of the Sun at the<br />

surface is ____________ the gravity of the Earth.<br />

• Volume of the Sun: 1.412 x 1018 km3 - That means you could fit 1.3<br />

Million planets the ___________________ into the sun!<br />

• Density of the Sun: 1.622 x 105 kg/m3<br />

• Everything in the _______________ orbits around the Sun, including<br />

8 planets and their moons, many dwarf planets, asteroids,<br />

comets and dust.


About the Sun<br />

The/Sun’s/diameter/is//////<br />

865,000/miles./////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

The/gravity/of/the/Sun/is/<br />

28/times/the/gravity/of///<br />

the/Earth.///////////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////


About the Sun<br />

The/Sun’s/diameter/is////////<br />

865,000/miles.//////////////<br />

///////////////////////////<br />

///////////////////////////<br />

The/gravity/of/the/Sun/is/28/<br />

times/the/gravity/of/the//////<br />

Earth.//////////////////////<br />

///////////////////////////<br />

///////////////////////////<br />

///////////////////////////


Facts About Mercury<br />

• Mercury is the closest planet to the Sun, just 36 million miles or<br />

0.39 AU out, but it is not the hottest planet.<br />

• Mercury is the smallest planet in our Solar System, and is just a bit<br />

larger than the Earth’s moon.<br />

• The diameter of Mercury is 3,032 miles.<br />

• It takes 87.97 Earth days for Mercury to orbit the sun.<br />

• One day on Mercury is equal to 59 Earth days.<br />

• If you weigh 100 pounds on Earth, you would weigh 38 pounds on<br />

Mercury.<br />

• Temperatures on Mercury range between -279 to 801 degrees<br />

Fahrenheit


Fill-In-The Blank Facts About Mercury<br />

• Mercury is the closest planet to the Sun, just 36 million miles or<br />

0.39 AU out, but it is not the ______________.<br />

• Mercury is the ______________ in our Solar System, and is just<br />

a bit larger than the Earth’s moon.<br />

• The diameter of Mercury is ______________.<br />

• It takes ______________ days for Mercury to orbit the sun.<br />

• One day on Mercury is equal to______________ Earth days.<br />

• If you weigh 100 pounds on Earth, you would weigh<br />

______________ on Mercury.<br />

• Temperatures on Mercury range between ______________<br />

Fahrenheit


Fill-In-The Blank Facts About Mercury<br />

• Mercury is the closest planet to the Sun, just 36 million miles or<br />

0.39 AU out, but it is not the ______________.<br />

• Mercury is the ______________ in our Solar System, and is just<br />

a bit larger than the Earth’s moon.<br />

• The diameter of Mercury is ______________.<br />

• It takes ______________ days for Mercury to orbit the sun.<br />

• One day on Mercury is equal to______________ Earth days.<br />

• If you weigh 100 pounds on Earth, you would weigh<br />

______________ on Mercury.<br />

• Temperatures on Mercury range between ______________<br />

Fahrenheit


About Mercury<br />

Temperatures/on/Mercury/<br />

range/between/-173/to////<br />

427/degrees.///////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

Mercury/is/the/closest/////<br />

planet/to/the/Sun./////////<br />

//////////////////////////////<br />

//////////////////////////////


About Mercury<br />

Temperatures/on/Mercury////<br />

range/between/-173/to/427//<br />

degrees.//////////////////////<br />

///////////////////////////<br />

///////////////////////////<br />

///////////////////////////<br />

Mercury/is/the/closest/planet/<br />

to/the/Sun./////////////////<br />

///////////////////////////


Facts About Venus<br />

• Venus is the second planet from the Sun.<br />

• Venus is 67 million miles from the sun - or 0.72 AU.<br />

• Venus is 7,521 miles in diameter<br />

• It takes 225 days for Venus to orbit the sun.<br />

• One day on Venus is equal to 243 Earth days<br />

• The surface temperature of Venus is 864 degrees F<br />

• If you weigh 100 pounds on Earth, you would weigh 91 pounds on<br />

Venus.<br />

• Venus is the second brightest object in the night sky: only the<br />

Moon is brighter. It is known as the Morning and Evening Star.


Fill-In-The Blank Facts About Venus<br />

• Venus is the ______________ planet from the Sun.<br />

• Venus is ______________ miles from the sun - or 0.72 AU.<br />

• Venus is______________ in diameter<br />

• It takes ______________ for Venus to orbit the sun.<br />

• One day on Venus is equal to ______________.<br />

• The surface temperature of Venus is ______________ F<br />

• If you weigh 100 pounds on Earth, you would weigh<br />

______________ on Venus.<br />

• Venus is the second brightest object in the night sky: only the<br />

Moon is brighter. It is known as the _____________________.


Fill-In-The Blank Facts About Venus<br />

• Venus is the ______________ planet from the Sun.<br />

• Venus is ______________ miles from the sun - or 0.72 AU.<br />

• Venus is______________ in diameter<br />

• It takes ______________ for Venus to orbit the sun.<br />

• One day on Venus is equal to ______________.<br />

• The surface temperature of Venus is ______________ F<br />

• If you weigh 100 pounds on Earth, you would weigh<br />

______________ on Venus.<br />

• Venus is the second brightest object in the night sky: only the<br />

Moon is brighter. It is known as the _____________________.


About Venus<br />

The/surface/temperature<br />

of/Venus/is/856/degrees.<br />

//////////////////////////////<br />

//////////////////////////////<br />

It/takes/225/days/for/////<br />

Venus/to/orbit/the/Sun.///<br />

//////////////////////////////<br />

//////////////////////////////


About Venus<br />

The/surface/tempterature/of///<br />

Venus/is/857/degrees/F.//////<br />

///////////////////////////<br />

///////////////////////////<br />

It/takes/225/days/for/Venus/<br />

to/orbit/the/Sun.////////////<br />

///////////////////////////<br />

///////////////////////////


Facts about Earth<br />

• The earth is 93 million miles from the sun - or one AU.<br />

• The diameter of the earth is 7,926 miles.<br />

• It takes the earth 365 days to orbit the sun.<br />

• Length of day: 24 hours (more precisely, 23 hours, 56 minutes and<br />

4 seconds.) That’s one rotation on the earth’s axis.<br />

• The surface temperature of the earth averages about 57 F, with<br />

ranges from -126 to 136 F.<br />

• 70 percent of the Earth’s surface is covered in oceans.<br />

• The earth has one moon.<br />

• Earth’s atmosphere is 78% nitrogen, 21% oxygen, and 1% various<br />

other gases.<br />

• Earth is the only world known to harbor life.


Fill-In-The Blank Facts about Earth<br />

• The earth is ______________ miles from the sun - or one AU.<br />

• The diameter of the earth is ______________.<br />

• It takes the earth ______________ to orbit the sun.<br />

• Length of day: ______________ (more precisely, 23 hours, 56<br />

minutes and 4 seconds.) That’s one rotation on the earth’s axis.<br />

• The surface temperature of the earth averages about 57 F, with<br />

ranges from ______________.<br />

• 70 percent of the Earth’s surface is covered in ______________.<br />

• The earth has one moon.<br />

• Earth’s atmosphere is 78% nitrogen, ______________, and 1%<br />

various other gases.<br />

• Earth is the only world known to harbor ______________.


Fill-In-The Blank Facts about Earth<br />

• The earth is ______________ miles from the sun - or one AU.<br />

• The diameter of the earth is ______________.<br />

• It takes the earth ______________ to orbit the sun.<br />

• Length of day: ______________ (more precisely, 23 hours, 56<br />

minutes and 4 seconds.) That’s one rotation on the earth’s axis.<br />

• The surface temperature of the earth averages about 57 F, with<br />

ranges from ______________.<br />

• 70 percent of the Earth’s surface is covered in ______________.<br />

• The earth has one moon.<br />

• Earth’s atmosphere is 78% nitrogen, ______________, and 1%<br />

various other gases.<br />

• Earth is the only world known to harbor ______________.


About the Earth<br />

Seventy/percent/of/the///<br />

Earth’s/surface/is/covered<br />

in/oceans.///////////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

The/Earth/is/93/million/////<br />

miles/away/from/the/Sun./<br />

//////////////////////////////<br />

//////////////////////////////


About the Earth<br />

Seventy/percent/of/the/Earth’s/<br />

surface/is/covered/in/oceans.///<br />

///////////////////////////<br />

///////////////////////////<br />

The/Earth/is/93/million/////<br />

miles/away/from/the/sun.////<br />

///////////////////////////<br />

///////////////////////////<br />

///////////////////////////


Facts about Mars<br />

• The distance from the Sun: Mars is the fourth planet from the sun<br />

at a distance of about 142 million miles or 1.52 AU.<br />

• The diameter of Mars is 4,217 miles.<br />

• It takes Mars 687 Earth days to orbit the sun.<br />

• The length of one day on Mars is 24 hours 37 minutes.<br />

• The surface temperature on Mars averages about -67 F, with<br />

ranges of -225 to +70 °F<br />

• Mars has a thin atmosphere made up mostly of carbon dioxide<br />

(CO2), nitrogen (N2) and argon (Ar).<br />

• If you weigh 100 pounds on Earth, you would weigh 38 pounds on<br />

Mars.


Fill-In-The Blank Facts about Mars<br />

• The distance from the Sun: Mars is the fourth planet from the sun<br />

at a distance of about ______________ miles or 1.52 AU.<br />

• The diameter of Mars is ______________.<br />

• It takes Mars ______________ Earth days to orbit the sun.<br />

• The length of one day on Mars is _______________________.<br />

• The surface temperature on Mars ______________ about -67 F,<br />

with ranges of -225 to +70 °F<br />

• Mars has a thin atmosphere made up mostly of carbon dioxide<br />

(CO2), nitrogen (N2) and ______________.<br />

• If you weigh 100 pounds on Earth, you would weigh __________<br />

on Mars.


Fill-In-The Blank Facts about Mars<br />

• The distance from the Sun: Mars is the fourth planet from the sun<br />

at a distance of about ______________ miles or 1.52 AU.<br />

• The diameter of Mars is ______________.<br />

• It takes Mars ______________ Earth days to orbit the sun.<br />

• The length of one day on Mars is _______________________.<br />

• The surface temperature on Mars ______________ about -67 F,<br />

with ranges of -225 to +70 °F<br />

• Mars has a thin atmosphere made up mostly of carbon dioxide<br />

(CO2), nitrogen (N2) and ______________.<br />

• If you weigh 100 pounds on Earth, you would weigh __________<br />

on Mars.


About Mars<br />

Mars/is/142/million/miles//<br />

from/the/sun.///////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

If/you/weigh/100/pounds//<br />

on/earth,/you/would/weigh<br />

38/pounds/on/Mars.///////<br />

//////////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////


About Mars<br />

Mars/is/142/million/miles//<br />

from/the/sun.///////////////<br />

///////////////////////////<br />

If/you/weigh/100/pounds/on/<br />

Earth,/you/would/weigh/38///<br />

pounds/on/Mars.////////////<br />

///////////////////////////<br />

///////////////////////////<br />

///////////////////////////


Facts about Jupiter<br />

• Jupiter is the fifth planet from the sun at a distance of about 484<br />

million miles or 5.2 AU.<br />

• The diameter of Jupiter is 88,730 miles.<br />

• Jupiter is the most massive planet in our solar system, 317 times<br />

the mass of Earth.<br />

• It takes Jupiter 11.9 Earth years to orbit the sun.<br />

• Jupiter rotates on it’s axis once every 9.8 Earth hours.<br />

• The temperature of Jupiter is -234 Farenheit.<br />

• Jupiter has a faint ring system, discovered in 1979 by the Voyager<br />

1 mission.


Fill-In-The Blank Facts about Jupiter<br />

• Jupiter is the fifth planet from the sun at a distance of about 484<br />

million miles or ______________.<br />

• The diameter of Jupiter is ______________.<br />

• Jupiter is the most massive planet in our solar system,<br />

______________ the mass of Earth.<br />

• It takes Jupiter 11.9 Earth years to ______________.<br />

• Jupiter rotates on it’s axis once every ______________.<br />

• The temperature of Jupiter is ______________ Farenheit.<br />

• Jupiter has a faint ______________, discovered in 1979 by the<br />

Voyager 1 mission.


Fill-In-The Blank Facts about Jupiter<br />

• Jupiter is the fifth planet from the sun at a distance of about 484<br />

million miles or ______________.<br />

• The diameter of Jupiter is ______________.<br />

• Jupiter is the most massive planet in our solar system,<br />

______________ the mass of Earth.<br />

• It takes Jupiter 11.9 Earth years to ______________.<br />

• Jupiter rotates on it’s axis once every ______________.<br />

• The temperature of Jupiter is ______________ Farenheit.<br />

• Jupiter has a faint ______________, discovered in 1979 by the<br />

Voyager 1 mission.


About Jupiter<br />

The/diameter/of/Jupiter///<br />

is/88,730/miles.////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

Jupiter/has/a/mass/of/<br />

317/times/that/of/earth.//<br />

//////////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////


About Jupiter<br />

The/diameter/of/Jupiter/is////<br />

88,730/miles.///////////////<br />

///////////////////////////<br />

///////////////////////////<br />

Jupiter/has/a/mass/of/317///<br />

times/that/of/Earth.//////////<br />

///////////////////////////<br />

///////////////////////////<br />

///////////////////////////


Facts about Saturn<br />

• Saturn is the sixth planet from the Sun at a distance of about 886<br />

million miles or 9.5 AU.<br />

• The diamete of Saturn is 74,900 miles.<br />

• It takes Saturn 29.5 Earth years to orbit the sun.<br />

• One day on Saturn is equal to 10.7 Earth hours<br />

• The temperature on Saturn is -288 Farenheit.<br />

• Saturn is a gas-giant planet and does not have a solid surface.<br />

• Saturn’s atmosphere is made up mostly of hydrogen (H2) and<br />

helium (He).<br />

• Saturn has a ring system made of seven rings with several gaps<br />

and divisions between them.<br />

• If you weigh 100 pounds on Earth, you would weigh about 107<br />

pounds on Saturn


Fill-In-The Blank Facts about Saturn<br />

• Saturn is the sixth planet from the Sun at a distance of about<br />

______________ or 9.5 AU.<br />

• The diamete of Saturn ______________ miles.<br />

• It takes Saturn ______________ years to orbit the sun.<br />

• One day on Saturn is equal to ______________ hours<br />

• The temperature on Saturn is ______________.<br />

• Saturn is a gas-giant planet and does not have a ___________.<br />

• Saturn’s atmosphere is made up mostly of ______________<br />

(H2) and ______________ (He).<br />

• Saturn has a ring system made of ______________ with several<br />

gaps and divisions between them.<br />

• If you weigh 100 pounds on Earth, you would weigh about<br />

______________ on Saturn.


Fill-In-The Blank Facts about Saturn<br />

• Saturn is the sixth planet from the Sun at a distance of about<br />

______________ or 9.5 AU.<br />

• The diamete of Saturn ______________ miles.<br />

• It takes Saturn ______________ years to orbit the sun.<br />

• One day on Saturn is equal to ______________ hours<br />

• The temperature on Saturn is ______________.<br />

• Saturn is a gas-giant planet and does not have a ___________.<br />

• Saturn’s atmosphere is made up mostly of ______________<br />

(H2) and ______________ (He).<br />

• Saturn has a ring system made of ______________ with several<br />

gaps and divisions between them.<br />

• If you weigh 100 pounds on Earth, you would weigh about<br />

______________ on Saturn.


About Saturn<br />

It/takes/Saturn/29.5///////<br />

Earth/years/to/orbit/the///<br />

sun.//////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

Saturn/is/a/gas/giant//////<br />

planet/and/does/not/have<br />

a/solid/surface.////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////


About Saturn<br />

It/takes/Saturn/29.5/Earth//<br />

years//to/orbit/the/Sun.//////<br />

///////////////////////////<br />

///////////////////////////<br />

Saturn/is/a/gas/giant/planet/<br />

and/does/not/have/a/solid////<br />

surface./////////////////////<br />

///////////////////////////<br />

///////////////////////////<br />

///////////////////////////


Facts about Uranus<br />

• Uranus is the seventh planet from the sun at a distance of about<br />

1.8 billion miles or 19.19 AU.<br />

• The diameter of Uranus is 31,763 miles.<br />

• Uranus spends 84 Earth years orbiting once around the sun.<br />

• Uranus rotates on it’s axis once during 18 Earth hours.<br />

• The temperature on Uranus is -357 Farenheit.<br />

• If you weigh 100 pounds on Earth, you would weigh 91 pounds on<br />

Uranus.<br />

• Uranus has 27 moons.<br />

• Uranus has faint rings; the inner rings are narrow and dark and<br />

the outer rings are brightly colored.


Fill-In-The Blank Facts about Uranus<br />

• Uranus is the ______________ from the sun at a distance of<br />

about 1.8 billion miles or 19.19 AU.<br />

• The diameter of Uranus is ______________ .<br />

• Uranus spends ______________ orbiting once around the sun.<br />

• Uranus rotates on it’ axis once during ______________ .<br />

• The temperature on Uranus is ______________ .<br />

• If you weigh 100 pounds on Earth, you would weigh<br />

______________ on Uranus.<br />

• Uranus has ______________ .<br />

• Uranus has faint rings; the ______________ are narrow and<br />

dark and the outer rings are brightly colored.


Fill-In-The Blank Facts about Uranus<br />

• Uranus is the ______________ from the sun at a distance of<br />

about 1.8 billion miles or 19.19 AU.<br />

• The diameter of Uranus is ______________ .<br />

• Uranus spends ______________ orbiting once around the sun.<br />

• Uranus rotates on it’ axis once during ______________ .<br />

• The temperature on Uranus is ______________ .<br />

• If you weigh 100 pounds on Earth, you would weigh<br />

______________ on Uranus.<br />

• Uranus has ______________ .<br />

• Uranus has faint rings; the ______________ are narrow and<br />

dark and the outer rings are brightly colored.


About Uranus<br />

Uranus/has/27/moons./////<br />

//////////////////////////////<br />

//////////////////////////////<br />

Uranus/rotates/on/it’s/axis<br />

once/during/18/Earth//////<br />

hours.////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////


About Uranus<br />

Uranus/has/27/moons.///////<br />

///////////////////////////<br />

///////////////////////////<br />

Uranus/rotates/on/it’s/axis////<br />

once/during/18/Earth/hours.//<br />

///////////////////////////<br />

///////////////////////////<br />

///////////////////////////


Facts about Neptune<br />

• Neptune is the eighth planet from the sun at a distance of about<br />

2.8 billion miles or 30.07 AU.<br />

• Neptune has a diameter of 30,775 miles.<br />

• It takes Neptune 165 Earth years to orbit the sun one time.<br />

• Neptune rotates on it’s axis in 16 Earth hours.<br />

• The temperature on Neptune is -353 degrees Farenheit.<br />

• Neptune’s atmosphere is made up mostly of hydrogen (H2), helium<br />

(He) and methane (CH4).<br />

• Neptune has six rings.<br />

• If you weigh 100 pounds on Earth, you would weigh 114 pounds on<br />

Neptune.


Fill-In-The Blank Facts about Neptune<br />

• Neptune is the eighth planet from the sun at a distance of about<br />

2.8 billion miles or ______________.<br />

• Neptune has a diameter of ______________.<br />

• It takes Neptune ______________ to orbit the sun one time.<br />

• Neptune rotates on it’s axis in ______________.<br />

• The temperature of Neptune is ______________.<br />

• Neptune’s atmosphere is made up mostly of ______________<br />

(H2), ______________ (He) and ______________ (CH4).<br />

• Neptune has ______________.<br />

• If you weigh 100 pounds on Earth, you would weigh<br />

______________ on Neptune.


Fill-In-The Blank Facts about Neptune<br />

• Neptune is the eighth planet from the sun at a distance of about<br />

2.8 billion miles or ______________.<br />

• Neptune has a diameter of ______________.<br />

• It takes Neptune ______________ to orbit the sun one time.<br />

• Neptune rotates on it’s axis in ______________.<br />

• The temperature of Neptune is ______________.<br />

• Neptune’s atmosphere is made up mostly of ______________<br />

(H2), ______________ (He) and ______________ (CH4).<br />

• Neptune has ______________.<br />

• If you weigh 100 pounds on Earth, you would weigh<br />

______________ on Neptune.


About Neptune<br />

The/temperature/on/Neptune/is/-353/degrees//////<br />

Farenheit.///////////////////<br />

//////////////////////////////<br />

//////////////////////////////<br />

Neptune/is/about/2.8/billion/miles/from/the/sun.///<br />

//////////////////////////////<br />

//////////////////////////////<br />

//////////////////////////////


About Neptune<br />

The/temperature/on/Neptune/<br />

is/-353/degrees/Farenheit.////<br />

///////////////////////////<br />

///////////////////////////<br />

Neptune/is/about/2.8/billion//<br />

miles/from/the/sun./////////<br />

///////////////////////////<br />

///////////////////////////<br />

///////////////////////////


Glossary of Terms<br />

Planet: a celestial body which is in orbit around the Sun, has sufficient<br />

mass to assume hydrostatic equilibrium (a nearly round<br />

shape), has “cleared the neighborhood” around its orbit, and is not a<br />

moon.<br />

Orbit: the curved path of a celestial object or spacecraft around a<br />

star, planet, or moon, especially a periodic elliptical revolution.<br />

Gravity: the force that attracts a body toward the center of the<br />

earth, or toward any other physical body having mass. For most<br />

purposes Newton’s laws of gravity apply, with minor modifications<br />

to take the general theory of relativity into account.<br />

AU (Astronomical Unit): For general reference, we can say that one<br />

astronomical unit (AU) represents the mean distance between the<br />

Earth and our sun. The AU is approximately 150 million kilometers or<br />

93 million miles.<br />

Farenheit: of or denoting a scale of temperature on which water<br />

freezes at 32° and boils at 212° under standard conditions.<br />

Diameter: a straight line passing from side to side through the center<br />

of a body or figure, especially a circle or sphere.<br />

Rotation: the action of rotating around an axis or center.


Fill-In-The-Blank Glossary of Terms<br />

Planet: a ______________ body which is in orbit around the<br />

Sun, has ______________ mass to assume hydrostatic equilibrium<br />

(a nearly round shape), has “cleared the neighborhood” around<br />

its orbit, and is not a ______________ .<br />

Orbit: the curved path of a celestial object or spacecraft<br />

around a star, planet, or moon, especially a periodic elliptical<br />

______________ .<br />

Gravity: the force that attracts a body toward the center of the<br />

earth, or toward any other physical body having _____________ .<br />

AU (Astronomical Unit): For general reference, we can say that one<br />

astronomical unit (AU) represents the ______________ between<br />

the Earth and our sun. The AU is approximately _____________ .<br />

Farenheit: of or denoting a scale of ______________ on which<br />

water ______________ at 32° and boils at ______________<br />

under standard conditions.<br />

Diameter: a straight line passing from side to side through the<br />

______________ of a body or figure, especially a circle or sphere.<br />

Rotation: the ______________ of rotating around an<br />

______________ or center.


Label the Planets in order from the Sun.

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