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A dwarf galaxy is a small galaxy composed of about million up to several billion stars, It is theorised that these are the cores of nucleated dwarf elliptical galaxies that have been stripped of gas and outlying stars by tidal interactions.
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Since galaxies evolve by merging and colliding with one another, collisions between galaxies will result in supermassive black hole pairs — the key part of this story. The black holes then collide and grow in size as well. A black hole that is more than a million times the mass of our son is considered supermassive. If indeed the supermassive black hole has a friend revolving around it in close orbit, the center of the galaxy is locked in a complex dance.

How many stars are there in the Universe?

The two supermassive black holes are orbiting each other, and at the same time, each is exerting its own pull on the stars around it. The gravitational forces from the black holes pull on these stars and make them change their orbit; in other words, after one revolution around the supermassive black hole pair, a star will not go exactly back to the point at which it began. Using our understanding of the gravitational interaction between the possible supermassive black hole pair and the surrounding stars, astronomers can predict what will happen to stars. Astrophysicists like my colleagues and me can compare our predictions to observations, and then can determine the possible orbits of stars and figure out whether the supermassive black hole has a companion that is exerting gravitational influence.

Using a well-studied star, called S, which orbits the supermassive black hole that lies at the center of the galaxy every 16 years, we can already rule out the idea that there is a second supermassive black hole with mass above , times the mass of the Sun and farther than about times the distance between the Sun and the Earth. If there was such a companion, then I and my colleagues would have detected its effects on the orbit of SO Such an object may not alter the orbit of SO-2 in a way we can easily measure. Supermassive black holes have gotten a lot of attention lately.

In particular, the recent image of such a giant at the center of the galaxy M87 opened a new window to understanding the physics behind black holes. For example, astrophysicists like myself would like to understand their impact on the central regions of galaxies and their role in galaxy formation and evolution.

The detection of a pair of supermassive black holes in the galactic center would indicate that the Milky Way merged with another, possibly small, galaxy at some time in the past.

Samsung: Yadada - It's Your Galaxy

The stretching wavelength that Einstein predicted — which makes the star appear redder — was detected and proves that the theory of general relativity accurately describes the physics in this extreme gravitational zone. But if the supermassive black hole has a partner, this could alter the expected result. Finally, if there are two massive black holes orbiting each other at the galactic center, as my team suggests is possible, they will emit gravitational waves.

The Milky Way devoured another galaxy and we've spotted the remains | New Scientist

Since , the LIGO-Virgo observatories have been detecting gravitational wave radiation from merging stellar-mass black holes and neutron stars. These groundbreaking detections have opened a new way for scientists to sense the universe. Any waves emitted by our hypothetical black hole pair will be at low frequencies, too low for the LIGO-Virgo detectors to sense.


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But a planned space-based detector known as LISA may be able to detect these waves which will help astrophysicists figure out whether our galactic center black hole is alone or has a partner. Want more?

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But it doesn't hold a candle to what'll come in Astrophysicists have discovered signs of a dozen black holes in the inner circle of the Milky Way and believe there could be 10, of them. The find is a breakthrough in understanding how black holes form. It might not be any bigger than your own refrigerator, but the TESS telescope will deliver the stuff of your wildest sci-fi fantasies: Earth-sized planets by the hundreds, and all in the next two years.

More info OK. Wrong language? Change it here DW. COM has chosen English as your language setting. COM in 30 languages. Deutsche Welle. Audiotrainer Deutschtrainer Die Bienenretter. News Milky Way gobbled up smaller galaxy in cosmic crash, astronomers find A long time ago, a galaxy not so far away merged with our own in a massive cosmic collision, scientists have discovered. Sky glow: The dark side of bright nights. Flashes from beyond the Milky Way.

A Nearby Cannibal Galaxy Is Going to Eat the Milky Way, Scientists Say

ESA space probe Gaia surveys 1. Scientists find new black holes in Milky Way Astrophysicists have discovered signs of a dozen black holes in the inner circle of the Milky Way and believe there could be 10, of them. Date Related content. News Taiwan election: President Tsai leads early vote count 1h ago. Twelve migrants killed as boat sinks off Greece 2h ago.