- What is the Universe?
- The next biggest part of space just past our solar system.
- The idea by Stephen Hawking to explain black-holes.
- All space and time and energy.
- The part of space that we can see.
- How old do scientists think the Universe is
- Old Mr. K, old!
- Around 20 million years
- 4.5 billion years
- 12-15 billion years
- What does red-shift mean in Astonomy?
- It was Edwin Hubble’s favorite football play back in college!
- Light from galaxies that are moving away from us have the wavelengths of its light stretched towards red or longer wavelengths.
- Other galaxies must have stars that have all made it to the red giant stage of star development.
- Light from galaxies that are moving away from us have the wavelengths of its light compressed towards blue or shorter wavelengths.
- How did Edwin Hubble interpret this observation?
- His loaf of raisin bread had risen and was ready for the oven.
- All other galaxies must have stars that “burn” a different kind of hydrogen as nuclear fuel
- All other galaxies are moving towards us then soon we can travel to other stars.
- That all other galaxies are moving away from us, and the Universe is expanding or getting larger
- An important line in the absorption spectrum of stars occurs at a wavelength of 656 nm for stars at rest (neither moving towards nor away from us).Imagine that you observe four stars (1-4) from Earth and discover that this absorption line is at the wavelength shown in the table below for each of the four stars.
Star Wavelength of Absorption Line 1 649 nm 2 660 nm 3 658 nm 4 647 nm
Which of the stars is moving with the greatest velocity away from Earth?- Star 1
- Star 2
- Star 3
- Star 4
- In order to be a star, what must be true of a body in space?
- It must produce it’s own light from nuclear fusion.
- It must reflect light from a nearby sun.
- It must have planets orbiting it with intelligent life.
- It must be at least 10 times more massive than our sun.
- What controls how long a star will live (or be actively producing light)?
- How long its parents lived.
- Its mass, the bigger they are the faster they burn their nuclear fuel.
- Its density. Dense stars can't get as much oxygen, so the fires last longer.
- The red-shift experienced by the 500 nm radiation.
- What happens to force a star out of the main sequence?
- Its waves lose step with the waves of other stars
- It becomes a black hole due to gravity inversion
- It runs out of Hydrogen and starts consuming Helium
- It develops planets and a solar system
- Use the H-R diagram below to answer the following question.
As a star leaves its main sequence stage, it gets_____,_______,_______,_______?
- cooler, smaller, bluer, and dimmer.
- hotter, larger, redder, and brighter.
- cooler, larger, redder, and brighter.
- hotter, smaller, bluer, and dimmer.
- If a star is 10 times more massive it will finally turn in to a _________?
- moon
- giant white dwarf
- black hole
- neutron star