Exploring the Cosmos - Degree Exam 2008 - Galaxies and Large Scale Structure
1. The age of our galaxy is about
100 to 150 million years.
10 to 15 thousand million years.
1.0 to 1.5 million million years.
100 to 150 thousand million years.
2. Our Sun is
a halo star in the disc of our galaxy about a third of the distance in from its edge.
in a globular cluster in the spherical component of our galaxy.
in one of the arms of the disc of our galaxy, close to its edge.
in one of the arms of the disc of our galaxy about a third of the distance in from its edge.
3. In our galaxy, dense concentrations gas and dust are found
in the central bulge.
everywhere in the galaxy.
in the thin disc.
everywhere in the disc.
4. Population I stars are found in the
arms of a spiral galaxy and have strong absorption lines in their spectra.
spherical component of a spiral galaxy and have weak absorption lines in their spectra.
spherical component of a spiral galaxy and have strong absorption lines in their spectra.
arms of a spiral galaxy and have weak absorption lines in their spectra.
5. Elliptical galaxies are believed to have been formed by
the collapse of a very large spiral galaxy.
the very rapid collapse of a super-massive cloud of dust and gas.
the merger of two or more elliptical or other types of galaxies.
matter that collected round a very massive black hole.
6. A Seyfert galaxy is a
disc shaped galaxy with a central bulge, little gas and dust and a low rate of generation of new stars.
spiral galaxy with a high rate of creation of new stars.
large elliptical galaxy with jets of matter that are ejected at high speed from its centre.
spiral galaxy whose nucleus is a very strong emitter of radio waves and sometimes X-rays.
7. In elliptical galaxies
there is much formation of new stars that is triggered by the formation of the galaxy in a collision of two or more galaxies.
the stars move round the centre on random orbits, there is much gas and dust but very little formation of new stars due to the lack of a disc structure.
the star move round the centre on random orbits, there is little gas and dust and very little formation of new stars.
there is a disc and a central bulge but little generation of new stars due to a lack of gas and dust.
8. Two stars, A and B, have the same intrinsic brightness. The distance to A is twothirds of the distance to B. Compared to B, A will appear to be
1.5 times brighter than B.
as bright as B.
two-thirds as bright as B.
2.25 (or 9/4) times brighter than B.
9. The Great Wall is
a dense concentration of galaxies that stretches across much of the visible universe.
a mechanism that explains the formation of the density waves that cause the creation of new stars in a spiral galaxy.
a dense concentration of galaxies in the nearby Virgo cluster.
an unusually dense concentration of stars, gas and dust in a nearby spiral arm of our galaxy.
10. Quasars are seen to be unusual because they are very
small bright objects whose large red shift indicates that they are very distant.
bright stars near the centre of our galaxy whose light is very red-shifted by the intense gravitational field from the super-massive black hole at the centre.
small stars with an extremely low luminosity because their mass is so small the almost failed to become stars.
compact distant galaxies with a large red shift that have many bright O type stars that makes them very luminous.
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