The Sun is a somewhat average-sized star, with enough room inside for a million Earths.

For a long time, it was thought that only Earth had liquid water among the planets in our solar system. NASA has just lately unveiled its most compelling evidence to date that Mars also has occasional running water!

Comets are made up of dust, ice, and carbon dioxide, and they date back to the formation of our solar system, some 4.5 billion years ago.

Jupiter, Saturn, Uranus, and Neptune lack a consistent surface, you couldn't possibly walk on them.

Traveling to Pluto via aeroplane would take more than 800 years.

The term "space garbage" refers to any inert, man-made object in Earth orbit. There are currently roughly 500,000 bits of space junk, according to scientists. This includes rocket and satellite debris, as well as common household things like spanners lost during the International Space Station's construction.

About once a year, an asteroid the size of a car enters Earth's atmosphere, but it is destroyed by atmospheric friction and heat long before it reaches the surface.

There is a mountain on the asteroid Vesta that is higher than any on Earth. It is a massive 22 kilometres in height, making it three times as tall as Mount Everest!

The number of stars in the universe much exceeds the number of sand grains on all of Earth's beaches combined. That has to be at least one quintillion!

It looks like blue sky when the sun sets on Mars.

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