Space begins where Earth’s atmosphere ends. There was a time when space was believed to be completely empty. However, this is not true. The vast gaps between the stars and the planets are filled with huge amounts of gases and dust. Even the emptiest parts of space contain at least a few hundred atoms or molecules per cubic meter.
• Space is black
There is neither air to breathe nor light to scatter in space, making it difficult for humans to survive. Space is black and not blue like a sky. This is because the number of oxygen molecules is comparatively less in space. It mainly consists of a vacuum and the molecules present are not sufficiently close because of which sound does not get transmitted.
• How big is it?
No one really knows how big space is. Long distances in space are measured in “light-year”, which represents the distance that light takes to travel in a year. This is roughly about 9.3 trillion km.
• Marvels of space
Besides vacuum, space consists of planets, stars, several hundred galaxies, matter, dust, gases and so on. Just like we have winds, there are solar winds that occur in space. Let us look at all the amazing things that exist high up in the heavens that leave us awestruck every time we explore them.