Beyond the Solar System — Test

Question 1

Which best explains why astronomers did not observe star formation in Region B?

Revolt · Accepted Answer

Radiation is heating the gas and dust, increasing thermal pressure.

Question 2

If the temperature in Region D were to increase significantly, what would most likely happen?

Revolt · Accepted Answer

Star formation would slow or stop.

Question 3

A distant star emits most of its light at a peak wavelength of 290nm Use Wien's Law to determine the star's approximate temperature.

Revolt · Accepted Answer

7552

Question 4

If a star's spectrum shows absorption lines at 656 nm, 486 nm, and 589 nm, which elements are most likely present in the star's atmosphere?

Revolt · Accepted Answer

hydrogen and sodium

Question 5

Which statement best explains the observed pattern in planetary composition?

Revolt · Accepted Answer

Planets farther from the star are mainly composed of frozen gases because they form in the coldest regions, where volatile compounds can condense.

Question 6

Choose the correct answer from each drop-down menu to complete the statements.

Revolt · Accepted Answer

density|pressure|fusion

Question 7

Which region of the H-R diagram does this star belong to?

Revolt · Accepted Answer

supergiants

Question 8

What does the data suggest about the motion of each star?

Revolt · Accepted Answer

Star X is moving toward Earth, while Star Z is moving away from Earth.

Question 9

Match each term to its definition.

Revolt · Accepted Answer

a dense, hot core of a collapsing nebula on its way to becoming a star|the state where outward pressure from energy balances inward gravitational pull|a process where particles collide and stick together to form larger bodies|a star that did not accumulate enough mass for nuclear fusion

Question 10

Two stars, Star X and Star Y, have the same radius, but Star X is twice as hot as Star Y. Based on the Stefan-Boltzmann Law, what can be said about their luminosities?

Revolt · Accepted Answer

Star X is sixteen times as luminous as Star Y.

Beyond the Solar System — Test Answers

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