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1

I should clear this up: the Milky Way isn't a completely well-defined body. Galaxies shouldn't be thought of as a single body — they are more like a collection of various material and stars. That said, I can only give you a wonky estimate of what might be the composition. By "Milky Way", I'm assuming you mean only the Milky Way's disc and halo (and not ...


9

The Galactic Coordinate system is a longitude-latitude coordinate system that is used to define the positions of objects in space, most commonly objects within our own galaxy. It uses the center of our galaxy as the focal point (i.e., where we consider $(0^{\circ},\:0^{\circ})$), much like we use the position just off Africa as the focal point of the Earth's ...


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If, the cycle is 70 million years and it will take 30 million years to cross the galactic center again. That means Earth last crossed it 5 million years ago?


3

At any one time, an average observer can see about 2,500 stars in a clear dark sky. Note that eyesight varies and sharp-eyed individuals may be able to see a half-magnitude dimmer stars than the average eye (apparent magnitude is a scale in which each integer is $2.51$ ($100^{0.2}$) times brighter or dimmer than the next consecutive integer.) A very dark sky ...


2

Too long for a comment, but it's an incomplete answer. The gravity waves detected were from a stellar mass binary black hole merger, sometimes abbreviated bbh for binary black hole. The two black holes are thought to be about 36 and 29 solar masses with a final combined mass of about 62. So, roughly 5% of the black hole mass turned into into gravitational ...


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Super massive and stellar mass black holes are different in mass and size.. Since we cannot describe nor we can be certain in either of their mass or size .. It's completely impossible (for the time being) to answer whether or not how much difference there will be regarding their energy release and the amount it releases..Yes,the energy is high 3 solar mass ...



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