CMBR ( Cosmic Microwave Background Radiation) comes from every direction in space. Where is it from?
Radiation created at the beginning of the universe
3 of 25
Big Bang theory is the only theory that can explain what?
Presence of CMBR
4 of 25
The fact that the further away a galaxy is, the more its light is red-shifted supports what idea?
The idea that the start of the universe could have been from a single explosion
5 of 25
What is a centripetal force?
A resultant force which pulls objects toward the centre of the circle, continually changing the direction that an object is travelling in to keep it in circular motion
6 of 25
What is Baryonic matter?
Atoms, Photons & Neutrinos
7 of 25
What does dark energy do?
Accelerate expansion of the universe
8 of 25
Approximately what temperature is CMBR?
-270 degrees Celsius
9 of 25
What shows "dark matter" to exist?
Galaxies rotating too fast for the mass of their stars
10 of 25
Stars much much bigger than the sun end up as what?
Neutron Stars or Black Holes
11 of 25
What colour stars would burn hottest?
Blue
12 of 25
What is fuel for the Sun right now?
Hydrogen fuel
13 of 25
What is "equilibrium" for a star?
Force of pressure from immense heat from fusion is in balance with the force of gravitational attraction
14 of 25
What is a nebula?
Clouds of gas and dust
15 of 25
How are elements heavier than iron formed?
Supernovae
16 of 25
The main sequence of a star ends when?
The hydrogen for nuclear fusion runs out
17 of 25
The Big Bang produced what?
Hydrogen and Helium
18 of 25
What is a use for a sattelite?
GPS
19 of 25
What is a natural sattelite?
The Moon
20 of 25
When a satellite is in orbit, it has a constant speed but a changing direction. What does this mean?
Changing velocity
21 of 25
What does a decrease in the ISS's speed mean (when at a constant height) ?
It will fall down to the Earth
22 of 25
Why are geostationary orbits useful?
It means the satellite is constantly over the same spot on earth
23 of 25
What describes the Earth's orbit around the Sun?
Elliptical
24 of 25
A Red Giant or Red Super-Giant does what?
Expansion and Nuclear Fusion of Helium
25 of 25
Other cards in this set
Card 2
Front
Red-shift shows what?
Back
The universe is expanding
Card 3
Front
CMBR ( Cosmic Microwave Background Radiation) comes from every direction in space. Where is it from?
Back
Card 4
Front
Big Bang theory is the only theory that can explain what?
Back
Card 5
Front
The fact that the further away a galaxy is, the more its light is red-shifted supports what idea?
Comments
No comments have yet been made