Scientists have suggested that a non-supermassive black hole may be hiding in the center of our galaxy. But then what takes its place?
With the light hand of Vladimir Vysotsky, Hinduism is considered a convenient religion: whatever happens in this life, nothing will go in vain, and in some of the endless series of rebirths, the final bliss will come. These mystical ideas find an unusual reflection in modern physics with its hypotheses about the existence of not one, but an infinite number of universes – an all-encompassing Multiverse, among the worlds of which all imaginable and unthinkable events unfold. In some of them, you are a musician, a military leader, a billionaire, or even a president.
The Hubble telescope has caught a flash of a bright supernova in the spiral galaxy NGC 2525. The drop in its brightness was captured in time and created an exciting timelapse.
At a distance of about 15,000 light-years from us, there is an active black hole that seems to periodically illuminate an unremarkable cloud of gas with gamma rays. But there's a catch: this cloud of gas is about 100 light-years away from the black hole and not in the path of jets shooting out of it. Therefore, it is not at all clear why it is pulsating.
A rare combination of circumstances may lead to the merger of black holes, accompanied by a flash of light, which usually does not occur. Now scientists have a detailed description of these circumstances, as well as the hope that such an event may happen again in the future and tell a lot about mysterious space monsters.
50 years ago, Roger Penrose presented the world with an idea describing a way in which extraterrestrial civilizations could receive energy from black holes. Now the scientist's theory could be proved using the achievements of the Soviet nuclear physicist Yakov Zeldovich.
Wormholes or tunnels in the fabric of space-time are terribly unstable. As soon as at least one photon hits them, the wormhole closes instantly. A new study suggests that the secret to stable wormholes is in their shape.
The event horizon is a hypothetical three—dimensional surface around a black hole. All material objects that cross this line never return from the womb of the cosmic monster. Even the fastest objects in the visible universe—particles of light—cannot overcome the huge attraction of a black hole if they cross the event horizon. But before reaching the area with maximum attraction, photons, according to the new theory, can dance their farewell waltz — spin into so-called light rings.
When a black hole absorbs an object, information about what it consisted of becomes inaccessible to an outside observer, even if he had the opportunity to look beyond the event horizon. A black hole is completely described by mass, electric charge and angular momentum, it has no other properties. In this sense, it is a very simple object. So says the most popular now (but not proven) hypothesis.
An unknown dark object has created a gap in the GD-1 stellar stream, located at a distance of about 45.5 thousand light-years from Earth. The most likely explanation for this gap is a supermassive black hole or a clot of dark matter that flew at high speed through a chain of stars.