L1: Structure,Age, Composition Flashcards
1
Q
Composed of protons, neutrons, electrons
A
Baryonic Matter
2
Q
Counteracts gravity
A
Dark Matter
3
Q
Newborn star
A
Protostar
4
Q
Nuclear fusion of hydrogen and helium
A
Thermonuclear reaction
5
Q
H2 nuclear fusion
A
Main Sequence Stars
6
Q
Distance of astronomical objects
A
Light Years
7
Q
The Solar System
A
Mercury, Venus,Earth,Mars, Jupiter, Saturn,Uranus, Neptune
8
Q
Age of Universe
A
13.8 b yrs old
9
Q
Age of Solar System
A
4.5 to 4.6 b yrs old
10
Q
Comprises all space and time, and all matter and energy
A
Universe
11
Q
What is the universe made of
A
4.6% baryonic matter, 24% cold dark matter, 71.5% dark energy
12
Q
Empty space between clusters
A
Practicallyan
13
Q
Diameter of the universe
A
91 b light yrs
14
Q
Density of the universe
A
4.5 x 10-31 g/cm³
15
Q
Can explain what may be holding galaxies together
A
Dark Matter
