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doc.madani
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I was wondering what is at the center of our galaxy? could it possibly be large amounts of nebula's in which we are orbiting around?
doc.madani said:I was wondering what is at the center of our galaxy? could it possibly be large amounts of nebula's in which we are orbiting around?
Glennage said:It's a supermassive black hole.
doc.madani said:can black holes absorb other black holes?
doc.madani said:does time exist in black holes?
Glennage said:It's a supermassive black hole.
Dmitry67 said:I assume that the Black Hole in our galaxy is 'dead', I mean, it had already consumed all the nearby stars. So it does not work as quasar and does not generate jets.
But what happens when it 'swallows' a star? From time to time there must be stars flying too close? And how often does that happen?
doc.madani said:i was reading some articles and found that the centre of our galaxy is made up of dark matter and dark energy,, and these dark matter and dark energy is what keeps our galaxy together,, through its enormous gravitation.. what are these dark matter and energy?
another thing,, does time require light?? in which light is the only constant in our universe therefore time can only be calculated through measuring and recording light??
so.. light does not exist in black holes therefore time wouldn't exist too?
doc.madani said:what is our universe expanding into? if we are expanding into nothing,,, what is the definition of nothing?
doc.madani said:hmmm yes,, but i still don't understand how the universe is expanding,, hard to explain,, if we were to travel to the edge of the universe what would we see on the other side?
russ_watters said:How does expanding imply collapse?
doc.madani said:oh, does expanding of the universe simply mean the increase in space between other matter? if so, if we continue to expand at this rate, can the universe collapse on its self?
No. Nothing travels, or appears to travel, faster than the speed of light in any reference frame. When something is traveling that fast (or any velocity) the amount of time that passes, changes. Its called time dilation. No matter what your velocity, you will always see light travel the same speed, c.doc.madani said:A little to special relativity, if one spaceship traveling at 0.9c north passes another spaceship traveling at 0.9c south,, wouldn't the ship traveling north see the spaceship traveling south to be traveling at 1.8c,, but that's impossible.. how did Einstein explain this theory?
It would see the other ship moving at approximately 0.994475c. In units such that c=1, the general formula isdoc.madani said:A little to special relativity, if one spaceship traveling at 0.9c north passes another spaceship traveling at 0.9c south,, wouldn't the ship traveling north see the spaceship traveling south to be traveling at 1.8c,, but that's impossible.. how did Einstein explain this theory?
The center of our galaxy is a supermassive black hole named Sagittarius A* (Sgr A*). It is located in the constellation Sagittarius and has a mass of about 4 million times that of our sun.
A nebula is a large cloud of gas and dust in space. It is typically created from the remains of a dying star or by the gravitational collapse of a giant molecular cloud. Nebulae can range in size from a few light-years across to hundreds of light-years.
Nebulae can have a variety of orbits in our galaxy, depending on their location and the gravitational forces in their vicinity. Some may have circular orbits around the center of our galaxy, while others may have more elliptical or irregular orbits.
There are three main types of nebulae found in our galaxy: emission nebulae, reflection nebulae, and dark nebulae. Emission nebulae emit light due to ionized gases, reflection nebulae reflect light from nearby stars, and dark nebulae absorb light, making them appear dark against a background of stars.
Scientists use a variety of tools and techniques to study the center of our galaxy and the orbits of nebulae. These include telescopes, radio telescopes, and satellites that can detect different wavelengths of light. Scientists also use computer simulations and models to study the complex dynamics of the center of our galaxy and the interactions between nebulae and other objects in our galaxy.