A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole is the biggest kind of black hole. Its gravity is more than a million times stronger than our sun's. It has v Contact online >>
A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole is the biggest kind of black hole. Its gravity is more than a million times stronger than our sun''s. It has very strong gravity that pulls in everything around it." clicked="0">supermassive black hole in the middle.
There are many galaxies besides ours, though. There are so many, we can''t even count them all yet! The The Hubble Space Telescope was launched in 1990. It orbits Earth and takes amazing pictures of stars, planets, and other galaxies. " clicked="0">Hubble Space Telescope looked at a small patch of space for 12 days and found 10,000 galaxies, of all sizes, shapes, and colors. Some scientists think there could be as many as one hundred billion galaxies in the universe.
Some galaxies are spiral-shaped like ours. They have curved arms that make it look like a pinwheel. Other galaxies are smooth and oval shaped. They''re called elliptical galaxies. And there are also galaxies that aren''t spirals or ovals. They have irregular shapes and look like blobs. The light that we see from each of these galaxies comes from the stars inside it.
Sometimes galaxies get too close and smash into each other. Our Milky Way galaxy will someday bump into Andromeda, our closest galactic neighbor. But don''t worry. It won''t happen for about five billion years. But even if it happened tomorrow, you might not notice. Galaxies are so big and spread out at the ends that even though galaxies bump into each other, the planets and solar systems often don''t get close to colliding.
We live in the Milky Way Galaxy, which is a collection of stars, gas, dust, and a supermassive black hole at its very center. Our Galaxy is a spiral galaxy, which are rotating structures that are flat (disk-like) like a DVD when looked upon edge-on.
There is also a bulge in the middle that consists of mostly old stars. When you look at a spiral galaxy face-on, you can see beautiful spiral arms where stars are being born. Our solar system is in the Orion arm, and we are about 25,000 light years (2.5 X 10^17 miles) from the very center of the Galaxy.
Since our solar system lies in one of the spiral arms, we live in the flat plane of the Milky Way. We can actually see the dense plane of the Milky Way stretch across the sky in dark places that do not have a lot of surrounding light pollution.
Annotated image of the Milky Way. The Galactic Center is unfortunately hidden by dark dust in visible light!
The very center of the Milky Way is known as the Galactic Center. It has a unique collection of very exotic objects that have intrigued astronomers for many decades.
Some examples include a quiescent supermassive black hole, a collection of wispy magnetic filaments, a few dense stellar superclusters which host mysterious and massive stars, and a family of gas streamers spiraling toward a central dark mass.
In order to study the Galactic center, we need to look at it at different wavelengths of light that our eyes are not sensitive to. This can also help us uncover what is happening at this very exciting part of our Galaxy.
Along with the young star clusters in the immediate vicinity of the Galactic Center, these clusters provide an ideal opportunity to study how stars and clusters form under extreme initial conditions.
Different kinds of telescopes are necessary to take data at these different wavelengths.
As you can see from these images, while the optical light is dark, the radio, sub-millimeter, mid-infrared, near-infrared, and X-ray light can all penetrate through the dust.
Different kinds of telescopes are necessary to take data at these different wavelengths. The quality of the data one gets from a telescope is often measured by the resolution of the telescope. This is proportional to the wavelength the data is taken at divided by the diameter of the telescope (Resolution ~ Wavelength/Diameter).
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