What is red-shift quizlet?
Redshift occurs when light source is moving away from the observer. Astronomers see redshift from the light from the galaxy, they know the galaxy is moving away from the earth. continous spectrum with dark crossed lines, light passes through cooler gases with specific elements.
Which term best describes dark matter?
Which of the following best describes dark matter? It is very large and invisible. A flattened combination of matter containing stars, gas, and dust in a spiral galaxy can be identified as: A disk.
What is a nuclear bulge?
nuclear bulge. a distribution of stars in the shape of a flattened sphere that surrounds the nucleus of a spiral galaxy like the Milky Way.
Where is the bulge in the Milky Way galaxy?
Bulges were historically thought to be elliptical galaxies that happened to have a disk of stars around them, but high-resolution images using the Hubble Space Telescope have revealed that many bulges lie at the heart of a spiral galaxy.
What is the bulge in the Milky Way galaxy?
Bulge. The bulge is a round structure made primarily of old stars, gas, and dust. The outer parts of the bulge are difficult to distinguish from the halo. The bulge of the Milky Way is roughly 10,000 light years across.
How thick is the bulge of the Milky Way?
In the center of the galaxy is the bar-shaped galactic bulge which harbors a supermassive black hole with a mass equal to that of about 3 million suns. Surrounding the central bulge is a relatively thin disk of stars about two thousand light years thick and roughly 100,000 light years across.
How far away is the galactic bulge?
Distance to the Galactic Center The exact distance between the Solar System and the Galactic Center is not certain, although estimates since 2000 have remained within the range 24–28.4 kilolight-years (7.4–8.7 kiloparsecs).
Why is the center of the galaxy so bright?
The black hole at the center of our galaxy is pulling in entire solar systems. A mixture of gasses and dust particles are being sucked towards the black hole under large amounts of pressure and heat due to friction. This makes the matter around the hole incredibly bright.