Space Facts

Scientific, historical and cultural facts about space, galaxies, the planets and other objects in the solar system. The latest discoveries and interesting space related features can be found on the blog, while the gallery highlights graphics and diagrams that illustrate more aspects of the the universe.

Check out some interesting space facts below:

  • Space does not begin at a specific altitude above the Earth, but the Kármán line at 100km is a commonly used definition.
  • The temperature in the void of space is about −270.45 °C.
  • Space is a hard vacuum, meaning it is a void containing very little matter.
  • 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.
  • 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.

Find more facts about each of the planets below:

More facts about the solar system below:

Find more facts about different galaxies below: