Where is sagittarius a in the sky

Messier 23 mag 5. NGC mag 6. NGC mag Kaus Media mag 2. Messier 21 mag 5. Messier 28 mag 6. Kaus Borealis mag 2. Messier 17 mag 6. NGC mag 7. Messier 20 mag 6. Alnasl mag 3. Messier 18 mag 6. Messier 54 mag 7. Messier 70 mag 7. Messier 69 mag 8. NGC mag 8. O-Sgr mag 3. Messier 75 mag 8. Rukbat mag 3. Arkab Prior mag 3. IC Location: 17h 45 m The black hole was detected within a cluster of seven stars and its mass was estimated at 1, solar masses.

The stellar orbits in the galactic centre show that the central mass concentration of four million solar masses must be a black hole, beyond any reasonable doubt. If it were, we would be able to see the object magnified as a result of gravitational lensing , a phenomenon that occurs because light of a distant source gets lensed, or bent by the gravity of an exceptionally massive object in the foreground.

The Einstein Cross in Pegasus constellation is a good example. In the main image, the brightest white dot is the hottest material located closest to the black hole, and the surrounding pinkish blob is hot gas, likely belonging to a nearby supernova remnant. The time series at right shows a flare caught by NuSTAR over an observing period of two days in July; the middle panel shows the peak of the flare, when the black hole was consuming and heating matter to temperatures up to million degrees Fahrenheit million degrees Celsius.

The main image is composed of light seen at four different X-ray energies. Blue light represents energies of 10 to 30 kiloelectron volts keV ; green is 7 to 10 keV; and red is 3 to 7 keV. The time series shows light with energies of 3 to 30 keV.

Image: NASA. In this image, observations using infrared light and X-ray light see through the obscuring dust and reveal the intense activity near the galactic core. Note that the centre of the galaxy is located within the bright white region to the right of and just below the middle of the image. The entire image width covers about one-half a degree, about the same angular width as the full moon.

They outline the energetic regions where stars are being born as well as reveal hundreds of thousands of stars. Red represents the infrared observations of Spitzer. The radiation and winds from stars create glowing dust clouds that exhibit complex structures from compact, spherical globules to long, stringy filaments.

Blue and violet represent the X-ray observations of Chandra. Globulars are spherical-shaped collections of stars, many much older than the galaxy itself. Open star clusters are not as tightly gravitationally bound as the globulars. Sagittarius also contains some lovely nebulae: clouds of gas and dust lit up by radiation from nearby stars. The most prominent objects to search out in this area of the sky are the Lagoon Nebula, the Trifid Nebula, and the globular clusters M22 and M Because we look at the galaxy from inside, it's very common to see clouds of gas and dust in the plane of the Milky Way.

This is especially true in Sagittarius. The Lagoon and Trifid Nebulae are the easit to spot, although they can generally only be seen well with binoculars or a small telescope.

Both of these nebulae contain regions where star formation is actively taking place. Astronomers see both newborn stars as well as protostellar objects in these regions, which helps them track the process of starbirth. The Trifid is also known as Messier 20 and has been studied by many ground-based observatories as well as Hubble Space Telescope. It will look somewhat dim but should be easy to spot in a small telescope. Its name comes from the fact that it looks like a little pool next to the brighter regions of the Milky Way.

The Trifid looks like it has three "lobes" connected together. They lie just over four thousand light-years away from us. Globular clusters are satellites of the Milky Way Galaxy. They often contain hundreds, thousands, or sometimes millions of stars, all tightly bound together by gravity. M22 which is the 22nd objects in Charles Messier's list of "Faint fuzzy objects" that he compiled in the 18th century , was first discovered in and contains about , stars all packed together in a region of space about 50 light-years across.

Another interesting globular cluster is also in Sagittarius. It's called M55, and was discovered in It contains just under , stars all gathered into an area bout 48 light-years across. It lies nearly 18, light-years away from us. Search out Sagittarius for other clusters and nebulae, especially using a pair of binoculars or a small telescope. Actively scan device characteristics for identification.

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