THE SPACE AND THE UNIVERSE
Space, also known as outer space, is the near-vacuum between celestial bodies. It is where everything (all of the planets, stars, galaxies and other objects) is found. On Earth, space begins at the Kármán line (100 km above sea level). This is where Earth's atmosphere is said to stop and outer space begins.
Outer space is not completely empty—it is a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, neutrinos, dust, and cosmic rays.
The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... Space is also filled with radiation (e.g. light and heat), magnetic fields and high energy particles (e.g. cosmic rays).Aug 20, 2013
In space, there is very little breathable oxygen. ... A ground—based experiment by an experimental astrophysicist at Syracuse University found that oxygen atoms cling tightly to stardust. This prevents the oxygen atoms from joining together to form oxygen molecules.
Looking toward the sun we thus see a brilliant white light while looking away we would see only the darkness of empty space. Since there is virtually nothing in space to scatter or re-radiate the light to our eye, we see no part of the light and the sky appears to be black.
No comments:
Post a Comment