# Astronomy

### 54 terms by kunderw1

#### Study  only

Flashcards Flashcards

Scatter Scatter

Scatter Scatter

## Create a new folder

Final exam

### Why do we have seasons on earth?

As earth goes around the sun and earth's axis remains pointed toward Polaris, the Northern and Southern hemispheres alternately receive more and less direct sunlight

### What is an astronomical unit?

The average distance from earth to the sun

### Keplers third law, p2=a3, means that?

All of the above are correct

### What conditions are required for a lunar eclipse?

The phase of the moon must be full, and the nodes of the moons orbit must be nearly aligned with earth and the sun

### We describe a position on earth's surface by stating its

Latitude and longitude

Kepler

### Keplers second law, which states that as a planet moves around its orbit it sweeps out equal areas in equal times, means that

A) A planet travels faster when it is nearer to the sun and slower when it is farther from the sun.

### What conditions are required for a solar eclipse?

B) The phase of the moon must be new, and the nodes of the moons orbit must be nearly aligned with earth and the sun

### Why do we see essentially the same face of the moon at all times

Because the moons rotational and orbital periods are equal

### All of the following statements are true. Which one explains the reason why there is not a solar eclipse at every new moon?

The orbital plane of the moon is tilted by about 5 degrees to the elliptic plane

### If part of the moon passes through earth's umbra, we will see a (n)

Partial lunar eclipse

Half moon

Galileo

### According to the universal law of gravitation, if you double the masses of both attracting objects, then the gravitational force between them will

Increase by a factor of 4

### Which of the following has your address in the correct order

You, earth, solar system, Milky Way, local group, local super cluster

### According to the universal law of gravitation, the force due to gravity is

Inversely proportional to the square of the distance between objects

### Why is it summer in the northern hemisphere when it is winter in the southern hemisphere?

The northern hemisphere is tilted toward the sun and receives more direct sunlight

### All of the following statements are true. Which one follows directly from Keplers third law?

Venus orbits the sun at a slower average speed than mercury

60kg

full

### By locating the north celestial pole in the sky, how can you determine latitude?

The altitude of the NCP is the same as your latitude

true

false

### What is the range of star masses for high mass stars?

between 8 and 100 solar masses

upper right

6000K

low-mass star

### What happens to energy in the convection zone of the sun?

energy is transported outward by the rising of hot plasma and the sinking of cooler plasma

### At the center of the sun fusion converts hydrogen into

helium, energy, and neutrinos

### What happens when the gravity of a massive star is able to overcome neutron degeneracy pressure

the core contracts and becomes a black hole

repel each other

carbon

upper left

obafgkm

### what is a planetary nebula?

the expanding shell of gas that is no longer gravitationally held to the remnant of a low mass star

lower right

the sun

photosphere

### white dwarfs are so called because

they are both very hot and very small

### which of the following sequences correctly describes the stages of life for a low mass star?

protostar, main sequence, red giant, white dwarf

### what kind of pressure supports a white dwarf

electron degeneracy pressure

### compared to the star it evolved from, a white dwarf is

hotter and dimmer

### why is there an upper limit to the mass of a white dwarf

the more massive the white dwarf the greater the degeneracy pressure and the faster the speeds of the electrons. near 1.4 solar masses the speeds of the electrons approach the speed of light so more mass cannot be added without breaking the degeneracy pressure

an m star

false

false

true

false

false

false

true

false

true

Example: