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Flashcards in Exam 3 Deck (45)
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1
Q

Big Bang Theory?

A

All of observable matter, energy, space and time was concentrated in one point.

2
Q

Age of Universe?

A

13.7 billion yrs old

3
Q

Center of the Universe?

A

There is no center because all positions are equivalent.

4
Q

Red Shift?

A

Stars and galaxies moving away from us.

5
Q

Expansion of space?

A

The further a galaxy is, the faster it is moving away from us.

6
Q

CMB?

A

Temperature or energy left over from the Big Bang.

7
Q

Expansion of space and raisin bread?

A

The galaxies (raisins) stay the same, space (dough) expands.

8
Q

Fate of our Universe?

A

It will expand forever.

9
Q

Dark Matter?

A

25%

10
Q

Dark Energy?

A

70%

11
Q

Light travel in miles per second?

A

186,000mps

12
Q

Who first proved that galaxies are located outside our own galaxy?

A

Edwin Hubble.

13
Q

What 3 galactic types make up the Hubble classification of galaxies?

A

Elliptical, Spiral, Irregular.

14
Q

Relative location of the older and younger stars in typical spiral galaxies?

A

Old: central region. Young: spiral arms.

15
Q

Are collisions of galaxies rare?

A

Fairly uncommon.

16
Q

Galaxy cluster?

A

large gravitational bound structure formed by a collection of hundreds to thousands of galaxies.

17
Q

Einstein cross?

A

Galactic phenomena of a single distant galaxy appearing to be multiple galaxies because of the frontal galaxy’s gravity bonding light.

18
Q

What makes up our largest structure in the universe?

A

Empty space

19
Q

Nebula?

A

Gas and dust collected in glaxies.

20
Q

Our home galaxy?

A

Milky Way

21
Q

How long does it take for our solar system to make one orbit around our galaxy?

A

250 millions yrs

22
Q

Our galaxy is what type of galaxy?

A

Barred-Spiral galaxy.

23
Q

Globular clusters?

A

Vast collection of stars.

24
Q

Magellanic Clouds?

A

Found in Southern Hemisphere and 2 dwarf irregular galaxies.

25
Q

Andromeda galaxy and its possible consequences to ours?

A

It is moving toward the Milky Way at 300,000mph and will eventually reach us in 5 billion years.

26
Q

Planetesimals?

A

Innumerable small bodies that orbit a star.

27
Q

Which direction do our planets orbit the sun?

A

counter-clockwise

28
Q

Apprx diameter of Sun?

A

865,000miles

29
Q

The Sun is?

A

Average Yellow Star

30
Q

Two types of super-giant stars?

A

Blue Super Giant and Red-Super Giant

31
Q

What is the fate of the Sun?

A

Red Giant.

32
Q

What if the Sun was 4x bigger?

A

Explosion in a supernova. Become a neutron star or a black hole.

33
Q

Locate exoplanets?

A

Star Wobbles

34
Q

Planets starting from the Sun?

A

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

35
Q

Mass of Jupiter to other planets?

A

11x that of the Earth

36
Q

Most moons are composed of what?

A

Water and some methane

37
Q

Where are most asteroids located in our Solar System?

A

Between mars and Jupiter

38
Q

Which asteroid did the US land on?

A

Eros

39
Q

3 types of meterorites?

A

Stony. Iron. Stony Iron

40
Q

Oort Cloud?

A

Spherical cloud of ice, gas, dust and rocks. In our solar system.

41
Q

Kuiper Belt?

A

Disk shaped, ice, gas, dust and rocks. Orbits Neptune

42
Q

Causes of meteor showers and shooting stars?

A

debris left in comet orbits.

43
Q

Origin of our moon today?

A

Space debris

44
Q

Moons sized compared to Earth?

A

1/4 of Earth

45
Q

When does the far side of the moon face Earth?

A

Never.