Our Evolving Universe
Self Test 10

1. Hubble's law, v=Hd, shows that
   1. the solar system is near the centre of the universe
   2. the universe is expanding
   3. the universe began in a big bang
   4. distant galaxies are seen as they were many years ago
   
   
2. Einstein introduced the cosmological constant into his equations so that
   1. they could describe an expanding universe
   2. they could describe a static universe
   3. they could describe a universe with accelerating expansion
   4. none of the above
   
   
3. A universe with positive curvature
   1. is infinite
   2. will expand forever
   3. has exactly the critical density
   4. should eventually recollapse in a Big Crunch
   
   
4. In the Steady State theory,
   1. the average density of the universe is always the same
   2. the universe is not expanding
   3. Einstein's theory of general relativity is wrong
   4. more than one of the above
   
   
5. A spacecraft travelling at speed v towards a planet shines a laser beam directly ahead of itself to map out its landing site. If the speed of light in a vacuum is c, an observer on the planet's surface will measure the speed of the laser beam from the spacecraft to be
   1. c + v
   2. c - v
   3. c
   4. (c² + v²)^1/2

out of 5.

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