Question

One way that astronomers detect planets around distant stars is by observing to see if there is a _________ in the light that reaches us from a particular star. The reason that the star moves away or toward us is a ________ due to the gravitational effects of the planet.

B. Doppler shift, contraction

D. Doppler shift, perturbation

Answer 1

D

Answer 2

Yes it will be perturbation . I think so.

Answer 3

Since Earth is attracted to the sun, why doesn't it fall into the sun?

B. Because it has sufficient tangential velocity

C. Because there is an equal force holding it away from the sun

Answer 4

What do you think about the answer @LilySwan ?

Answer 5

both actually

Answer 6

i think its C

Answer 7

B and C are both linked. earth is supported by an equal force away from the sun(Centrifugal force) because of the sufficient tangential velocity that earth has.

Answer 8

so which one can be the most appropriate

Answer 9

if one has to choose one of them, pick C

Answer 10

You are communicating with aliens on Jupiter and Saturn. When you send a light beam message to your friend on Jupiter and receive a message from your friend on Saturn, you realize that the light messages became curved when they passed by the sun. What would be the sum of the angles in the triangle formed by the paths your messages take?

A. 0 degrees

C. 180 degrees

D. a number larger than 180 degrees

Answer 11

i think its C
light travels in a straight line

Answer 12

its D, a number larger than 180 degrees