5-10-13
Astronomy
QUIZ
1. Dark matter is the name
given to the unseen mass whose gravity governs that observed motions of stars
and gas clouds.
2. Orbital velocities within
galaxies remain nearly constant at large radii, indicating that most of the
matter lies outside the visible regions.
3. Masses measured from
galaxy motions, temperature of hot gas, and gravitational lensing all indicate
that the vast majority of matter in clusters is dark.
4. Either dark matter exists
or our understanding of our gravity must be revised.
5.Most astronomers suspect
that dark matter is made of nonbaryonic particles that have not yet been
discovered.
6.The gravity of dark matter
seems to be what draws gas together into protogalactic clouds, initiating the
process of galaxy formation.
7. Galaxies appear to be
distributed in gigantic chains and sheets that surround great voids.
8. Fritz Zwicky was a Swiss
astronomer. He worked most of his life at the California Institute of
Technology.
9. Vera Cooper Rubin is
an American astronomer. In 1951, she completed her education and she made one of
the first observations and deviations from the Hubble flow in the motions of
galaxies.
10. Alex Filippenko is an
American astrophysicist and professor of astronomy at the University of
California, Berkeley.
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