Why do astronomers hypothesize that a massive black hole lies at the center of m87? historical records show that a supermassive star at the center of m87 exploded as a supernova, leaving behind a black hole. time-lapse images from space telescopes show stars falling to the center of m87 and then disappearing from view. images of m87 made with powerful telescopes show a well-defined black region devoid of any stars. a very small region at the center of m87 releases an enormous amount of energy.
Solved
Show answers
More tips
- F Food and Cooking Homemade kvass: recipe and brewing process...
- O Other What is a Disk Emulsifier and How Does it Work?...
- H Health and Medicine How to Calm Your Nerves? Expert Tips That Actually Work...
- A Animals and plants 5 Tips for Taking Care of Yews to Keep Them Green and Beautiful...
- S Sport How to wrap boxing hand wraps? Everything you need to know!...
- F Food and Cooking 10 Reasons Why You Should Avoid Giving Re-Gifts: An Informative Guide...
- F Family and Home Tender Care for Your Parquet: Is it Possible to Clean Parquet?...
- S Style and Beauty How Are Eyelash Extensions Applied? All Your Questions Answered...
- F Food and Cooking 10 Tips for Proper Sushi Consumption...
- S Style and Beauty Learn how to tie a keffiyeh on your head like a pro...
Answers on questions: Physics
- M Mathematics The force of gravity, F, exerted between two objects is equal to the product of the gravitational constant, G, the mass of the first object, m1, and the mass of the second object,...
- M Mathematics The winds howl on a bitterly cold day at the quick change franchise. during the entire afternoon (a four hour period) only twenty-four cars are serviced. each car required four quarts...
- H History Antonio wants to write about the high cost of a college education. Which question would best guide his research? What college scholarships are available? How important is it to graduate...
- B Business Suppose that an initial $20 billion increase in investment spending expands GDP by $20 billion in the first round of the multiplier process. Also assume that GDP and consumption...
- B Biology Please help with number 8,9and 10 If the killer whale obtained 26000 joules of energy by eating crab-eater seal, how much energy was available at each of the following trophic levels...
Ответ:
According to Einstein's theory of relativity, a black hole is a "singularity" that consists of a region of the space in which the density of matter tends to infinity. In consequence, this huge massive body has a gravitational pull so strong that not even light can escape from it.
In addition, "the surface" of a black hole is called the event horizon, which is the border of space-time in which the events on one side of it can not affect an observer on the other side.
In other words, at this border also called "point of no return", nothing can escape (not even light) and no event that occurs within it can be seen from outside.
In this sense, and according to the relativity, it is possible to determine where a black hole is if it is "observed" an enormous amount of energy released. So, in accordance to this, galaxies like ours must have a black hole in its center.
On the other hand, the elliptical galaxy Mesier 87 (also called Virgo A, but from now on M87) was showing the above described behaviour, with enormous jets of high-energy particles shooting away from its vicinity . This was imaged by the Hubble Space Telescope years ago; that is why astronemers were hypothesizing about the existence of a massive black hole there.
Well now, on April, 10th 2019 this was demonstrated with the publication of the image, for the first time, of the event horizon of the black hole in M87. This is the first time in human history a picture of a black hole is taken.
This was done by the huge effort of diverse scientist and by the syncronization of eight radio telescopes scattered across the Earth (located at: Hawaii, Spain, Chile, Mexico, Arizona and the South Pole), which took the same point of the sky at the same time.
Ответ:
That 'band' around the globe is called the "Tropic Zone". It's the entire part of the surface of the Earth where the sun can ever be directly overhead.