How far can James Webb see?

about 13.7 billion light-years away
The James Webb Space Telescope can look much farther into deep space, about 13.7 billion light-years away, which means it can look 13.7 billion years back in time. That’s just 100 million years after the universe was born.

How long in seconds does it take light to travel from the Sun to Earth?

499.0 seconds
Light travels at a speed of 299,792 kilometers per second; 186,287 miles per second. It takes 499.0 seconds for light to travel from the Sun to the Earth, a distance called 1 Astronomical Unit.

Could we see dinosaurs roaming the Earth through a wormhole?

If we somehow traveled through a wormhole that lead us to someplace 65 million light years away, and then we looked back at earth (with an extremely powerful telescope) could we see the dinosaurs roaming the earth? In theory, yes. In practice, it’s much harder, because the earth is so small and 65 million light years is a long distance.

How far back in the past can you see the Earth?

If you had a mirror on the moon (about 238K miles away), you could see about 2.5 seconds into 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.

Is it possible to travel 65 million light years to Earth?

In theory, yes. In practice, it’s much harder, because the earth is so small and 65 million light years is a long distance. For perspective, all the visible stars in the night sky are within about 1,000 light years of us. The Milky Way is about 100,000 light years across.

How much light energy does a dinosaur emit?

The dinosaur reflects some of that — let’s say it’s got a 30\% albedo (frustratingly, the internet doesn’t seem to know what the albedo of a lizard is). A largish dinosaur might present a surface to the observer of 300 m 2 or so, so that’s 100 kW of light energy being emitted.