- At the end of life-cycle, when a star losses its light and the density increases (very high), by this time, it is largely composed of neutrons and hence known as “Neutron Star”.
- A star with low temperature and small mass (glowing feebly) is known as “Red Dwarf”.
- A type of star that is much smaller and denser than the sun, gives off a relatively dim white light, is known as “White Dwarf”.
- A star whose brightness changes over time, usually in a predictable way is known as “Variable Star”.
- A star which is larger than the Sun is known as “Giant Star”.
- A star which is smaller than the Sun is known as “Dwarf Star”.
- Half of a planet r moon is called “Hemisphere”. The top half is the ‘Northern Hemisphere’ and the bottom half is the ‘Southern Hemisphere’.
- The imaginary line around the middle of a planet, dividing its northern hemisphere from its southern hemisphere is known as “Equator”.
- Solar eclipse occurred on 15th January 2010 to be the longest one for next “One Thousand Years”.
- The longest total solar eclipse of the 21st century, lasting up to six minutes and 38.8 seconds, occurred on 22th July 2009.