Is it possible to see what happened in the past?

The actual past, as the totality of all that has happened, is, indeed, irrecoverable. The meaningful past, however, is accessible through the transmitted, written records. Such records are to the historian what fossil remains and rock strata are to the geologist, or artifacts to the archaeologist.

How do telescopes see light years away?

Thanks to a Gravitational Lens, Astronomers Can See an Individual Star 9 Billion Light-Years Away. When looking to study the most distant objects in the Universe, astronomers often rely on a technique known as Gravitational Lensing. This technique has allowed for the study of individual stars in distant galaxies.

How far into the past can we see the Earth’s past?

If that mirror was on Pluto, you could see about 13.4 hours into Earth’s past. If you are relying on hearing, you hear an event at 30 m away about 0.1 s after it occurs. That is why runners often watch the starting pistol at an event, because they can see a more recent picture of the past than they can hear.

What would happen if a telescope is not large enough?

If the telescope isn’t large enough, the resolutionwould be low, and the observer wouldn’t be able to make out things far away. To get an idea, the size (diameter of mirror for instance) of the telescope that’ll enable you to see an object of about 10m at that distance is about $10^{8}$km while the diameter of earth is about 12800 km. But again]

Can You See Yourself being born 27 light years away?

That is why runners often watch the starting pistol at an event, because they can see a more recent picture of the past than they can hear. To more directly answer the intent of your question: Yes, if you could magically be transported 27 lightyears away, or had a mirror strategically placed 13.5 lightyears away, you could see yourself being born.

How old is the Sun compared to what we see it?

Or how it looked 4.2 years ago. Telescopes like the Hubble are looking at galaxies 100 million light years away; just as the sun is actually eight minutes older than what we see, we’re looking at the galaxies as they looked 100 million years ago.