With the naked eyes, we can see the stars and the planets within the Milky Way. With a telescope we can see the Andromeda galaxy, which is 3 million light years away. With a strong magnifying telescope, a lot of galaxies and stars can be viewed. Telescopes are of different kinds. Earlier, telescopes were built using lenses-the largest measured 1 m in diameter, but the later telescopes worked mainly with mirrors. The Hubble space telescope can see the farthest in the space. In 2004, it took a picture of a region of the sky that is 13.7 billion light years away. One can see the galaxies, the way they looked like just after the Big Bang.
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