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and Cosmology

Extragalactic Astronomy and Cosmology: An Introduction

Extragalactic Astronomy and Cosmology: An Introduction

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1. Introduction <strong>and</strong> Overview<br />

28<br />

Fig. 1.28. The two Keck telescopes on<br />

Mauna Kea. With Keck I the era of large<br />

telescopes was heralded in 1993<br />

Fig. 1.29. The left panel shows a map of the location of the<br />

VLT on Cerro Paranal. It can be reached via Antofagasta,<br />

about a two-hour flight north of Santiago de Chile. Then another<br />

three-hour trip by car through a desert (see Fig. 1.30)<br />

brings one to the site. Paranal is shown on the right during<br />

the construction phase; in the foreground we can see the construction<br />

camp. The top of the mountain was flattened to get<br />

a leveled space (of diameter ∼ 300 m) large enough to accommodate<br />

the telescopes <strong>and</strong> the facilities used for optical<br />

interferometry (VLTI)<br />

able galaxies of redshift z 3, which are normally<br />

so dim that they cannot be examined with smaller<br />

telescopes.<br />

The largest ground-based telescope project to date<br />

was the construction of the Very Large Telescope (VLT)<br />

of the European Southern Observatory (ESO), consist-

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