Can someone please interpret this phrase “nebula are the birth place and the graveyard of stars.”?
The phrase means that new stars are formed in nebulae, and nebulae are often formed when old stars die. A nebula is a huge cloud of dust and gas. More than one nebula are “nebulae” (with an ‘e’ at the end). Nebulae are some of the most visually striking features of space, and the Hubble telescope took some amazing and beautiful ones. Dust particles and gas molecules clump together in a nebula due to gravity. Stars are formed after enough dust and gas clump together to collapse into a high-density mass. It’s a gradual and slow process, but once enough the matter accumulates, it falls in on itself, and the molecules are pressed together so much that they ignite a nuclear fusion reaction. This is what powers stars. After a very long time, the star runs out of material to fuel this nuclear reaction. Then there are all kinds of things that might happen, depending on how large the star is. They can form highly dense “neutron stars” or even black holes if they are massive enough. Sometimes a
