A star ia luminous body of gas, mostly hydrogen and helium.Star generate light, which makes it possible for us to them with a telescope or the naked eye. They also release energy from nuclear fission reaction in their core.
Brighest Star
Heaviest Star
HDE 269810 is a star in the Large magellainc Cloud- 170,000 light year from Earth ( a ligth year is the distance light travels in a year). It has been discovered by the Hopkins Ultraviolet Telescope to be 190 times as heavy as our Sun.
Largest Star
The largest star is the M-class supergiant Betelgeuse, or Alpha Orionis.It is the top left star in the constellation of Orion, which is 310 light year away.It has a diameter of 700 million km, which about 500 times greater than that of the Sun.
Nearest Star
Proxima Centauri, discovered in 1915 is 4.22 light years (39,953,525,879,212 km) from Earth.A apaceship moving at 40,000 km/h - which is faster than any human has yet travelled in space- would take more than 114,000 year to reach it.
Supernovae
These are vast explosions in which a whole star is blow up. They are extremely bright, rivalling for a few days the combined light outputs of all the star in the galaxy.Supernovae are rare- the last one in our galaxy was seen in 1604 by the German astronomer Johnnes Kepler.
Quasars
Quasars are extremely distant radio galaxies- galaxies giving out large amount of radio energy - and the brighest objects in the Universe. Even those near the most distant edge of the observable Universe are easily detected by small radio telesopes.Their radio emission is typically 1,000,000 to 100,000,000 times greater than that a normal galaxy, and they are as bright as or brighter than the brighest radio galaxies.
Black holes
A black hole is star that has collapsed into itself. It has a surface gravity so powerful that nothing can escape from within it.
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