Space facts

What are the space facts that you like the most ? Like the most interesting one.

No one can hear you scream in space. It's because sound is vibrations that travel through matter and since space is mostly vacuum, no vibrations can travel through it, hence no sound and no one can hear you scream.

No one can hear you scream in space. It's because sound is vibrations that travel through matter and since space is mostly vacuum, best matter and since space is mostly vacuum

Theres a defined radius in which humanity can move. There is no way that humanity could every cross that radius.

Not really a fact, but a question. Is the Universe infinite or do you think it has an end?