Show:
Origin of the Universe
13.1
Measuring Distances in Space
13.2
The Birth of Stars and the Sun
13.3
Stars: Old Age, Death, and New Life
13.4
Galaxies and the Milky Way/Dark Energy and Expansion of the Universe
16.5/13.6
100
What colours does the visible spectrum contain?
Red, orange, yellow, green, blue and purple.
100
What is a light year?
The distance that light travels in a year.
100
Name the three stages of a star.
Beginning, midlife, and end.
100
What is the diagonal band in a HR diagram called?
Main sequence
100
Who first proposed that the universe is expanding?
Edwin Hubble.
200
What does COBE & WMAP stand for?
COBE - Cosmic Background Explorer WMAP - Wilkinson Microwave Anisotropy Probe
200
What is a baseline?
It is an imaginary line from which the distance to an object is measured.
200
What forms a star?
A nebular
200
What does an HR diagram do?
Plots the life of stars.
200
What is dark matter and dark energy?
Dark matter is theorized to be some form of elementary particle yet to be discovered. Responsible for the gravity needed to hold the galaxies together, behaves like normal matter. Dark energy is thought to be a stabilizing force in the universe; based on the idea that the universe contains energy in empty space. This energy, part of space itself is increasing, not slowing down the expansion of the universe.
300
Explain the Big Bang Theory.
The universe started as a tiny, dense hot mass and blew up.
300
What is a parallax?
The apparent motion of a nearby star against the background of more distant non-moving stars.
300
What is nuclear fusion?
When hydrogen nuclei fuse to form helium nuclei.
300
How big does a star have to be to create a supernova?
Over 10 solar masses.
300
How much of the universe is dark energy?
73%.
400
What two discoveries did Edwin Hubble recognize?
The existence of other galaxies other than our own and that they're slowly moving away from us.
400
What is absolute magnitude and apparent magnitude?
Absolute: actual amount of light the star gives off. Apparent: brightness of a star as it appears.
400
What is solar wind and how does it affect Earth?
It is ionized gas and it creates aurora borealis and can disrupt electronics and communication.
400
How does a red giant become a white dwarf?
When a red giant sends out streams of gas and dust into space, it will begin to lose mass. A star with initial mass up to 10 solar masses will lose enough mass that it will become a stable white dwarf.
400
How much of the universe is the visible spectrum?
0.4%.
500
Define "red shift".
The movement of spectral lines towards red end of spectrum
500
How fast does light travel?
3x10^5 km/s
500
Name all the parts of the sun.
Core, radiative zone, convective zone, photosphere, chromosphere, and corona.
500
If a star's initial mass is between 10 and 50 solar masses, what would the supernova produce?
A neutron star.
500
Starting from the Big Bang 13.7 billion years ago, in volume, how much is the universe estimated to be expanding by?
1 x 10^12 cubic light years a minute.