Astronomy

How far has Voyager 1 travelled in space?...

I've heard about black holes but don't understand what they are. How do they form and why can't light escape from them?...

Is the universe infinite or does it have boundaries? How do scientists estimate the size of the observable universe?...

Why does the Moon appear to change shape throughout the month? What causes the different phases we see?...

Besides our Sun, what is the closest star to Earth and how far away is it? How do astronomers measure such vast distances?...