Day: May 28, 2013

Temperature of Earth without Atmosphere

Temperature of Earth without Atmosphere During the day time, when the heat radiation from the sun...

When the fan operates in a closed room, the motion of the air molecules increases. The increase in...

The Solar System consists of the Sun and those celestial objects bound to it by gravity. These...

Posted by Physics And Universe | May 28, 2013 | Stars |

In 2nd century BC Hipparchus compiled a catalog of stars. Based on this catalog Ptolemy introduced...