想知( F.2 Sci)

Factually, the space does not contain any air. Therefore, it is impossible to tell the components of air in space.

In the space, there are various planets (e.g. Jupiter) and suns (e.g. The Sun). The air on different planets are different. For example, the atmosphere of the Earth consists of 78% nitrogen and 21% oxygen, with trace amounts of water vapor, carbon dioxide and other gaseous molecules.

Another example is Mars. The atmosphere on Mars consists of 95% carbon dioxide, 3% nitrogen, 1.6% argon, and contains traces of oxygen and water. The atmosphere is quite dusty, containing dust particulates of about 1.5 µm across which give the Martian sky a tawny color when seen from the surface.

太空有極稀少的氫氣和少得可憐的氦。