A particular star shows spectral lines of the lithium isotope 6Li. What conclusion do astronomers draw from this observation?

A) The star has vaporized one of its planets that spiraled in too close to the star because the star's own 6Li was destroyed by nuclear reactions long ago. B) The star has not yet begun nuclear reactions in its core because these reactions destroy 6Li. C) Planets must be orbiting around the star because only planets show 6Li spectral lines. D) The star is composed of pristine (unmodified) material from the Big Bang because 6Li has been destroyed in material that has been processed in stars and expelled back into space. A) The star has vaporized one of its planets that spiraled in too close to the star because the star's own 6Li was destroyed by nuclear reactions long ago. B) The star has not yet begun nuclear reactions in its core because these reactions destroy 6Li. C) Planets must be orbiting around the star because only planets show 6Li spectral lines. D) The star is composed of pristine (unmodified) material from the Big Bang because 6Li has been destroyed in material that has been processed in stars and expelled back into space.

Exam 5: Exoplanets and the Formation of Planetary Systems

An astronomer is trying to detect an exoplanet via the transit method. Which of these changes to a particular planet will make it EASIER to detect, if everything else about the planet is unchanged?

(Multiple Choice)

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Question 41

Which of these pairs of exoplanet detection methods are MOST similar in the physical processes underlying the methods?

(Multiple Choice)

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Question 42

In order to detect multiple planets around a single star using the transit photometry method, the planets must have nearly the same

(Multiple Choice)

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Question 43

Where in the universe are heavy elements with masses greater than that of helium being produced at this time?

(Multiple Choice)

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Question 44

An astronomer discovers a protoplanetary disk with spiral waves. This may be evidence for

(Multiple Choice)

4.9/5

(34)

Question 45

Which of these have been detected around nearby stars?

(Multiple Choice)

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Question 46

Exoplanets have been detected around binary stars through

(Multiple Choice)

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(31)

Question 47

Asteroids have been detected around nearby stars through

(Multiple Choice)

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(39)

Question 48

What is the typical radius of the majority of extrasolar planets so far discovered?

(Multiple Choice)

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Question 49

An astronomer is trying to detect an exoplanet via the radial velocity method. Which of these changes to a particular planet will make it harder to detect, if everything else about the planet is unchanged?

(Multiple Choice)

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(26)

Question 50

The solar system was formed about how long after the Big Bang?

(Multiple Choice)

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Question 51

How many terrestrial exoplanets have been discovered to date with planets that could contain liquid water?

(Multiple Choice)

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Question 52

All of these are possible mechanisms believed to be capable of triggering the collapse of a cloud of gas and dust to form stars EXCEPT

(Multiple Choice)

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Question 53

An astronomer is trying to detect an exoplanet via the astrometric method. Which of these changes to a particular planet will make it easier to detect, if everything else about the planet is unchanged?

(Multiple Choice)

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(44)

Question 54

How was the vast majority of the hydrogen in the universe formed?

(Multiple Choice)

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Question 55

How far away is the nearest known exoplanet?

(Multiple Choice)

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Question 56

Which characteristic MOST directly determines whether a piece of material inside a dense core will eventually become part of the protostar or the protoplanetary disk that surrounds it?

(Multiple Choice)

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Question 57

Why do astronomers NOT believe that terrestrial exoplanets with orbits smaller than Mercury's orbit are relics of hot Jupiters in similar orbits?

(Multiple Choice)

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(34)

Question 58

Astronomers have searched for extrasolar planets for decades. Which one of these statements about the current status of the search is NOT true?

(Multiple Choice)

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(27)

Question 59

A particular star shows spectral lines of the lithium isotope ⁶Li. What conclusion do astronomers draw from this observation?

(Multiple Choice)

4.8/5

(42)

Question 60

Showing 41 - 60 of 98

An astronomer is trying to detect an exoplanet via the transit method. Which of these changes to a particular planet will make it EASIER to detect, if everything else about the planet is unchanged?

Which of these pairs of exoplanet detection methods are MOST similar in the physical processes underlying the methods?

In order to detect multiple planets around a single star using the transit photometry method, the planets must have nearly the same

Where in the universe are heavy elements with masses greater than that of helium being produced at this time?

An astronomer discovers a protoplanetary disk with spiral waves. This may be evidence for

Which of these have been detected around nearby stars?

Exoplanets have been detected around binary stars through

Asteroids have been detected around nearby stars through

What is the typical radius of the majority of extrasolar planets so far discovered?

An astronomer is trying to detect an exoplanet via the radial velocity method. Which of these changes to a particular planet will make it harder to detect, if everything else about the planet is unchanged?

The solar system was formed about how long after the Big Bang?

How many terrestrial exoplanets have been discovered to date with planets that could contain liquid water?

All of these are possible mechanisms believed to be capable of triggering the collapse of a cloud of gas and dust to form stars EXCEPT

An astronomer is trying to detect an exoplanet via the astrometric method. Which of these changes to a particular planet will make it easier to detect, if everything else about the planet is unchanged?

How was the vast majority of the hydrogen in the universe formed?

How far away is the nearest known exoplanet?

Which characteristic MOST directly determines whether a piece of material inside a dense core will eventually become part of the protostar or the protoplanetary disk that surrounds it?

Why do astronomers NOT believe that terrestrial exoplanets with orbits smaller than Mercury's orbit are relics of hot Jupiters in similar orbits?

Astronomers have searched for extrasolar planets for decades. Which one of these statements about the current status of the search is NOT true?

A particular star shows spectral lines of the lithium isotope ⁶Li. What conclusion do astronomers draw from this observation?

Discovering the Night Sky

Gravitation and the Motion of the Planets

Light and Telescopes

Atomic Physics and Spectra

Formation of the Solar System

Earth and the Moon

The Other Terrestrial Planets

The Outer Planets

Vagabonds of the Solar System

The Sun: Our Extraordinary Star

Characterizing Stars

The Lives of Stars From Birth Through Middle Age

The Death of Stars

Black Holes: Matters of Gravity

The Milky Way Galaxy

Galaxies

Quasars and Other Active Galaxies

Cosmology

Astrobiology

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