When a star becomes a white or red dwarf, its size is no greater than that of the Earth and it shines a little just before dying. It then dies out after several billion years and becomes dark and invisible in the sky. Its surface becomes solid then icy. If a star is much heavier …
The Sun as well as all the stars that you see in the sky are born in a huge cloud of gas and dust whose center denser and hot has finally light up. How did this happen? One has to imagine a place in the space containing a lot of gas and dust, a protostellar …
When you observe the sky for several months, you will see that the planets evolve slowly through the stars. Former observers have noticed that in a few years, the planets always went through the same constellations and that the Sun also followed the same path. These constellations became the 12 zodiac signs used by astrologers, …
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.[1] The 88 modern constellations are formally defined regions of the sky together covering the entire celestial sphere. (Wikipedia) Since ancient times men …
A black hole is a very special star. It’s a dead star that has collapsed on itself and ends up measuring only a few kilometers in diameter. Its attraction is so strong that it prevents even the light from escaping from its surface, making it black. Although a black hole is invisible, the larger ones …