Space & Astronomy

Telescopes and Distant Galaxies

How telescopes have grown from simple glass lenses into giant space observatories that reveal distant galaxies.

B29 min

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1For centuries, astronomers have used telescopes to study the night sky in detail.

2The earliest telescopes were simple tubes with glass lenses at each end.

3Modern instruments are enormous machines that collect light with mirrors several metres wide.

4Bigger mirrors gather more light, so astronomers can see fainter and more distant objects.

5Some telescopes now orbit the Earth, far above the clouds and city lights.

6The Hubble Space Telescope has sent home stunning pictures of distant galaxies.

7Each galaxy contains billions of stars, along with gas, dust and dark matter.

8Our own galaxy, the Milky Way, is just one among countless others.

9Light from the most distant galaxies has travelled for billions of years.

10When we observe them, we are actually looking far back in time.

11New space telescopes promise to reveal even earlier chapters of cosmic history.

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