Space Facts

Explore the site to find scientific, historical and cultural facts about space, galaxies, the planets and other objects in the solar system.

Or check out some interesting space facts below:

  • The universe is observed to be 13.8 billion years old has been expanding since its formation in the Big Bang.
  • In the observable universe there are an estimated 2 trillion (2,000,0000,000,000) galaxies.
  • The space between galaxies is not completely empty but has an average of one atom per cubic meter.
  • There are an estimated 100-400 billion stars in our galaxy, the Milky Way.
  • Our solar system is made up of the Sun, planets, dwarf planets, moons, and numerous smaller objects such as comets and asteroids.
  • There are 8 planets in our solar system, they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
  • Together the planets make up 0.14% of the solar systems mass, 99% of which is the gas giants (Jupiter, Saturn, Uranus and Neptune).
  • Except for the Earth, the planets are named after gods from Roman and Greek mythology.
  • The combined mass of all the Moons in the solar system is less than 0.1% of the Earths mass.

Select a category from the menu or one of the pages below to learn more: