3 astronomy questions?

Question

1. a consequence of the big bang is that the soace between certain astronomical boject is expanding as time goes on. which of the following is expanding?

a. the solar system
b. the milky way
c. the clocal supercluster
d. everything is expanding
e neither the solar sytstem nor the milky way is expanding

2. if the sun suddenly increased to twice its current mass, what would happend to the earth?

a. it would get sucked into the sun
b. it would orbit more slowly
c. it would orbit at a greater speed
d. it would move away to a greater distance away from the sun
e. nothing would change

3. the earth has seasons for which of the following reasons?

a. there is a distinct difference in earth's distance from the sun between january and july
b. the earth's equator is not in the same plane as the ecliptic
c. the sun has a noticeable change in its energy output over one year
d. both a and b are correct
e. none of the above are corroect

Answer 1

1: d. Everything is expanding, down to the least little thing. We tend to see bigger things and think only of the distance between a couple, but they themselves are expanding as well.

2: c. Totally blowing off how it happened because the important issue is how the earth would be if the sun were twice as massive, the earth would orbit closer and closer to the sun until it hit a new stable orbit. Since angular momentum does not decrease and the orbit is smaller, the earth would speed up.

3: b. The tilt of the earth leads to the seasons. There is a difference in distance between January and July but our orbit is too close to circular for that to matter as much the tilt. If that were, however, the only factor (no tilt), there would be permanant bands of weather parallel to the equator right up to the poles in which the temperature would vary a little as the year passed but not enough for seasons. So a. does have an effect but the tilt rather exceeds it. (The tilt changes how much of the sun's energy hits the earth in a given spot. The greater a body's tilt, the greater the variation.) To further make it clear, consider that when the northern hemisphere has summer, the southern hemisphere is having winter and vice versa. We are in the same spot in space on the same day and the two hemispheres are experiencing such radically different seasons...

Answer 2

1= D
2=C
3= D

Answer 3

for #3 its e and for #1 its either d or e

for #2 its A

Answer 4

Great questions. I want these answered too.

Answer 5

c

c

d

Answer 6

E,E,E