Astronauts can grow up to 5 cm taller in space.
In microgravity, the spine stretches due to lack of compression, temporarily increasing their height.

There may be more stars in the universe than grains of sand on Earth.
Astronomers estimate the observable universe has over 1,000,000,000,000,000,000,000,000 stars.

Venus is the hottest planet, even hotter than Mercury.
Though Mercury is closer to the Sun, Venus has a thick atmosphere that traps heat (greenhouse effect).

There’s a massive black hole at the center of our galaxy.
Sagittarius A* is a supermassive black hole 4 million times more massive than the Sun.

Light from the Sun takes about 8 minutes to reach Earth.
So when you see sunlight, you’re actually seeing the Sun as it was 8 minutes ago.

Saturn’s density is so low, it could float on water.
If you had a big enough ocean, Saturn would actually float – it’s made mostly of gas.

The largest volcano in the solar system is on Mars – Olympus Mons.
It’s nearly 3 times taller than Mount Everest and would cover the whole country of France.

A day on Mercury lasts longer than its year.
Mercury rotates very slowly, taking 59 Earth days for one spin, but orbits the Sun in just 88 Earth days.

Neutron stars are insanely dense – a teaspoon weighs billions of tons.
These collapsed stars pack more mass than the Sun into a tiny sphere just 20 km wide.

Space is completely silent – there’s no sound.
Sound needs a medium (like air) to travel, but space is a vacuum, so sound can’t move through it.