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Do stars exist in space between galaxies or are stars confined solely to galaxies?
It's very rare but a star can be created outside a galaxy. I don't have any examples but they exist and it's rare.
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How do us humans know that there are millions of other galaxies? If galaxies are millions of years apart, how do scientists know that there are billions of other galaxies and that andromeda is the closest?
There are a ton of extremely powerful telescopes both here on Earth and in space that is capable of looking billions of light years far. And we can see a...
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Which would be more likely to collide: stars with stars or galaxies with galaxies?
Many galaxies are members of groups or clusters. Since groups and clusters contain so many galaxies relatively close together, it should not be surprising that galaxies sometimes collide with each...
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How do quasars and active galaxies differ from normal galaxies?
Most galaxies have a supermassive black hole at their centres. Most galaxies have little material falling into the black hole. Young galaxies and galaxies which have collided with others have...
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Which would be more likely to collide, stars with stars or galaxies with galaxies?
Stars tend to exist in a binary setup. That is, two stars orbiting about each other. Our star, , is an exception although there is discussion that maybe a long...
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What appears to be the central energy-generating system or engine that is producing prodigious amounts of energy in the centers of galaxies, active galaxies and quasars?
When things fall to the ground, they are picking up energy from the gravitational field. In the case of Earth the gravitational field is modest but still offers enough energy...
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The Hubble telescope captured galaxies in the eastern direction of the universe. Images came back proving that galaxies are made up of different colors. What would explain the reason for the make of colors in galaxies?
Galaxies early on in their lives are actively forming hot, new stars and appear more bluish. Older galaxies are forming fewer new stars and their constituent stars are older on...
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Galaxies are millions of light years away and we are able to capture images through cameras in telescopes. Do scientists leave the telescope pointing at space until the galaxies slowly start to appear? Or do they zoom in into space?
A few galaxies are bright enough to see something of them with the naked eye. For example, in the northern hemisphere we can see the centre of the Andromeda Galaxy...
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If gravity clumps matter together into galaxies, why are there separate galaxies? Wouldn't all matter in the universe be in one clump?
Gravitational force is a central force that pulls things radially inward. However objects, in general, have non-zero tangential components which contribute to their Angular Momentum. Angular momentum is a conserved...
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What really holds galaxies together - Gravity or Dark energy?
Gravity is an attractive force. If you subscribe to the Dark Energy camp then it is proposed that Dark Energy is the repulsive force expanding the universe, the opposite of...
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