In 1974, astronomers observed Sagittarius B2, a giant molecular cloud 390 light-years from the galactic center. In 2022, Mark Balick said, “for the hell of it,” that they turned the Green Bank instruments onto the galactic center itself on February 13-15, 1974. 

Sagittarius A*, a supermassive black hole, sits at the very heart of the Milky Way. It’s about 4 million times the mass of the sun and consumes anything that strays too close. Scientists suspect that similar behemoths lurk at the heart of almost all large galaxies in the cosmos

Fifty years ago, two young astronomers seeking evidence of starbirth in this radiation-blasted hinterland stumbled upon the singular colossal object that lurks at this barycenter of our everything: a supermassive black hole

Yes, Sagittarius A* (Sgr A*) is a supermassive black hole at the center of the Milky Way. It’s located in the constellation Sagittarius, about 25,000 light years from Earth

In 1974, Bruce Balick and Robert L. Brown discovered Sgr A*. In 1982, Brown assigned the asterisk * to distinguish it from the larger Sagittarius A region. 

Astronomers have concluded that Sgr A* is the central black hole of the Milky Way based on observations of stars orbiting it. They estimate that its mass is 4.297±0.012 million solar masses. Its shadow diameter is about half the size of Mercury’s orbit

Based on mass and increasingly precise radius limits, astronomers have concluded that Sagittarius A* must be the central supermassive black hole of the Milky Way galaxy. The current value of its mass is 4.297±0.012 million solar masses

Sagittarius A* has a mean radius of 1,20,00,000 km. Its event horizon has a radius of 12 million km (7 million miles). 

Sagittarius A*’s Schwarzschild radius is about 44 million kilometers in diameter, which is 31 times the diameter of the sun. 

However, Sagittarius A*’s apparent size when viewed from Earth is tiny because it is so far away

Sagittarius A* (Sgr A*) has a mass of about 4.3 million solar masses. However, some say that this is fairly small for a supermassive black hole. 

Sgr A*’s mass is contained within a volume with a radius of no more than 17 light-hours. NASA says that a few million Earths could fit inside the space of Sgr A*

Sagittarius A* (Sgr A*) has a mass equivalent to 4.3 million suns. However, some say that this is fairly small for a supermassive black hole. 

Sagittarius A* is so massive that it could fit comfortably within the orbit of Mercury, the closest planet to the sun

Author of The Andromeda Galaxy; Higher then Everest: An Adventurer’s Guide to the Solar System; and others. Sagittarius A* (Sgr A*), supermassive black hole at the centre of the Milky Way Galaxy, located in the constellation Sagittarius and having a mass equivalent to four million Suns

The Milky Way is estimated to be 13.6 billion years old. It’s a barred spiral galaxy that contains stars, planets, asteroids, and nebulae. The Milky Way is about 100,000 light-years across, but some estimates say it’s 110,000 light-years across. If you include the outermost stars and the dark matter halo, it’s even larger

The Sun and Earth are estimated to be around 4.6 billion years old. The Sun is located about 8 kpc from the center of the Milky Way, on the Orion Arm

Sagittarius A* is a supermassive black hole at the center of the Milky Way galaxy. It’s located in the Sagittarius constellation, about 26,000 light-years from Earth. 

Astronomers have concluded that Sagittarius A* is the Milky Way’s central black hole based on its mass and radius. It has a mass of about 4 million times the sun’s mass. 

Black holes are completely dark because nothing can escape their gravity, including light. However, black holes are surrounded by gas clouds, which astronomers can measure to create images of the black holes. The dark region in the image is a shadow cast by the black hole onto the gas. 

Astronomers can also determine the mass and radius of a central body by observing the gravitational influence it has on the objects that orbit it

The Milky Way does not orbit anything, including Sagittarius A*. However, everything in the Milky Way orbits the baryonic center of the galaxy, and Sagittarius A* is located near that center. 

Sagittarius A* is the still point around which the Milky Way revolves. The area around the black hole is called Sagittarius A, and it contains hundreds of billions of stars that rotate around the black hole.

Yes, the Milky Way orbits a black hole. Everything in the Milky Way, including our solar system, orbits Sagittarius A*. 

However, galaxies are held together by their own gravity, not by a black hole. The Milky Way’s total mass is tens of billions of solar masses, which is much larger than the black hole’s four million solar masses. If the black hole and its gravitational field were removed, it wouldn’t have much effect on the Milky Way

The supermassive black hole at the center of the Milky Way is spinning so fast that it’s warping the fabric of space-time. Scientists estimate that the black hole is spinning at nearly its maximum rate. 

The black hole’s radio source, Sagittarius A*, appears motionless relative to background stars. However, it has a proper motion of 2.7 milli-arc-seconds per year receding in right-ascension

f the Milky Way’s black hole were to disappear, the effects of its missing gravity would travel outwards at the speed of light. The sun wouldn’t feel any difference for about 26,000 years. 

However, some say that nothing would really happen if the black hole were removed from the center. This is because the stars don’t orbit the galaxy because of the black hole, but because of all the mass in the galaxy. The black hole is typically only a small fraction of the mass. 

Without the black hole’s strong gravitational force, many objects would escape from the galaxy

If the Milky Way’s black hole becomes active, it would only affect the local area and not Earth. It would also be a spectacular sight at X-ray and radio wavelengths. 

A black hole is considered active when it collects a lot of gas around it, which heats up and glows brightly. This is called an active galactic nucleus (AGN). 

A black hole can become active again due to a number of events, including:

• Galactic collisions or mergers 
• An event that destabilizes a star’s orbit, causing it to spiral inward Black holes can also become inactive, or “quiescent” or “dormant”. When this happens, the only way to detect the black hole is by its gravitational effect on nearby objects. 

According to NASA, no black hole is close enough to be a danger to us. Even the most massive black holes that are directly facing Earth aren’t a threat. 

The black hole at the center of the Milky Way is 26,000 light-years away. Some say that we have nothing to worry about from the black hole in our galaxy’s heart for at least another four billion years. 

Black holes don’t hunt, and they’re not roaming around space eating stars and planets. At a distance, their gravitational pull is no more compelling than a star of the same mass

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