Do telescopes come back to Earth?

With the retirement of NASA's space shuttle fleet in 2011, there are no spacecraft currently in operation that could collect Hubble and return it to Earth. Hubble's orbit is relatively stable, so it will not be immediately de-orbited when it stops working.

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And another question, how far back in time can hubble see?

about 10-15 billion light-years The farthest that Hubble has seen so far is about 10-15 billion light-years away. The farthest area looked at is called the Hubble Deep Field. What is the farthest thing we have seen in space? Also in 2004, a team using both the Hubble Space Telescope and the Keck Observatory discovered a galaxy that is believed to be about 13 billion years away from us. It was found when observing the galaxy cluster Abell 2218. The light from the distant galaxy was visible because of gravitational lensing.

You can also ask how far in the universe can we see?

about 46.5 billion light years away So the furthest out we can see is about 46.5 billion light years away, which is crazy, but it also means you can look back into the past and try to figure out how the universe formed, which again, is what cosmologists do. Can I see Hubble from Earth? But there's a catch. Hubble is best seen from areas of the Earth that are between the latitudes of 28.5 degrees north and 28.5 degrees south. This is because Hubble's orbit is inclined to the equator at 28.5 degrees.

How do JWST mirrors work?

The primary mirror segments and secondary mirror are moved by six actuators that are attached to the back of each mirror piece. The primary mirror segments also have an additional actuator at its center that adjusts its curvature. The telescope's tertiary mirror remains stationary. How far away from Earth will the telescope be? The James Webb Space Telescope will not be in orbit around the Earth, like the Hubble Space Telescope is - it will actually orbit the Sun, 1.5 million kilometers (1 million miles) away from the Earth at what is called the second Lagrange point or L2.

What is the purpose of the mirrors in the telescope?

They use mirrors to collect and focus the light towards the eyepiece. Mirrors are lighter than lenses and they are also easier to shape into a smooth and perfect surface. If there are any flaws in a telescope's optics (eg. the mirrors or lenses) then the image created will appear warped or out-of-focus and blurry.