Energy and matter that emits little or no light but interacts with celestial objects.
What is the evidence for dark matter in galaxies?
Weighing spiral galaxies with rotational curves and weighing elliptical galaxies.
What is the evidence for dark matter in clusters of galaxies?
Orbital velocities, x-ray emission and gravitational lensing.
Does dark matter really exist?
Yes, or our current understanding of gravity is wrong.
What might dark matter be made of?
MACHOs and WIMPs.
What is the role of dark matter in galaxy formation?
It clumps together and manipulates celestial objects with gravity.
What are the largest structures in the universe?
Large quasar groups
Who was Fritz Zwicky?
Zwicky found that clusters have huge mass to light ratios
Who is Vera Rubin?
measured the rotation curves for various spiral galaxies.
Who is Alex Filippenko?
An American astrophysicist and professor of astronomy at the University of California, Berkeley.
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