16 JUL 2013 by ideonexus
Physiological Effects from Exposure to a Vaccum
Vacuum doesn’t have a temperature of its own,
so space is not really that cold. It’s a great insulator
too, meaning that your core body heat doesn’t get
sucked away. Without an atmosphere to transfer heat
away, the risk of exposure is somewhat mitigated. The saliva on your tongue may boil off, as it’s not
pressurized like your blood is, and you may get some
frost on your skin. Sunburn from direct contact with
the sun’s ultraviolet rays is a more immediate danger
than perishing from ...A good description.
12 DEC 2011 by ideonexus
The Four Forces of Nature
1. Gravity. This is the weakest of the four, but it is a long-range force and acts on everything in the universe as an attraction. This means that for large bodies the gravitational forces all add up and can dominate over all other forces.
2. Electromagnetism. This is also long-range and is much stronger than gravity, but it acts only on particles with an electric charge. being repulsive between charges of the same sign and attractive between charges of the opposite sign. This means the ele...Gravity, Electromagnetism, the Strong and Weak Nuclear Forces with brief descriptions.