Astronomers think that most galaxies are centered by a (blackhole?) , which exerts (a gravitational pull?) that binds the galaxy together.

Sometimes an explanation is helpful!?? What is wrong with you? Kids in online programs have almost no instruction and if you have information, the kind thing to do is to provide it. For Earth Science, WE HAVE NO TEXTBOOK. People who post here are desperate. Don't be so snarky and just help, if you can....

1.atronomers think that most galaxies are centered by a 1black hole, which exerts 2gravitational pull that binds the galaxy together.

2.A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses.
3.To form a nebula, 1gravity pulls matter together or causes 2an explosion
4.Its mass is greater than 20 times the mass of the sun.
Its mass is greater than 20 times the mass of the sun.
it is dying
5.Black holes trap all light.
6.the center of the Milky Way
7.These galaxies include irregular, spiral, and elliptical types.
8.interactions with light
100% just got the answers for you lol

I was asking if my answers were right

Black whole, Gravitational pull

Yes, astronomers believe that most galaxies are indeed centered around a supermassive black hole, which exerts a strong gravitational pull that helps bind the galaxy together.

Now, let me explain how astronomers have come to this conclusion. The presence of supermassive black holes at the centers of galaxies is supported by various lines of evidence:

1. Gravitational Effects: Astronomers can observe the motion of stars and gas within a galaxy. They have found that the velocities of these objects increase as they approach the center of the galaxy, indicating the presence of a massive object. By studying the laws of gravity, scientists have determined that these observations can be best explained by the existence of a supermassive black hole with immense gravitational influence.

2. Active Galactic Nuclei (AGN): Some galaxies exhibit incredibly bright centers known as active galactic nuclei. These nuclei emit vast amounts of energy, often in the form of intense radiation and powerful jets of particles. These extreme phenomena are thought to be caused by the accretion of material onto a central supermassive black hole.

3. Stellar Orbits: In our own Milky Way galaxy, astronomers have been able to track the orbits of stars near the galactic center. They have observed that these stars can only be explained if there is a supermassive black hole at the center, providing the necessary gravitational force to keep the stars in stable orbits.

4. Radio Observations: Radio telescopes can detect radio emissions from supermassive black holes. By studying these emissions, astronomers can estimate the mass and location of the black hole within a galaxy, providing further evidence for the presence of a supermassive black hole at the center.

Overall, through a combination of gravitational effects, AGN observations, stellar orbits, and radio observations, astronomers have gathered compelling evidence that most galaxies host a supermassive black hole at their center, exerting a gravitational pull that helps hold the galaxy together.

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