A) A change in a living cell's DNA B) A change in an organism that turns it into a different species C) A change in the type of food an organism consumes D) A change in the physical appearance of a living organism A) A change in a living cell's DNA B) A change in an organism that turns it into a different species C) A change in the type of food an organism consumes D) A change in the physical appearance of a living organism

Exam 18: Life in the Universe

The "rare Earth hypothesis" holds that Earth-like planets will prove to be quite rare. Which of the following statements best sums up the current status of the debate over this hypothesis?

(Multiple Choice)

4.8/5

(83)

Question 41

Why might the presence of a giant planet be both good and bad for life on a terrestrial planet in another solar system?

(Essay)

4.9/5

(80)

Question 42

The analysis of Martian meteorites found on the Earth show that they contain

(Multiple Choice)

4.8/5

(85)

Question 43

The requirement of liquid water is the most severe constraint on the development of life.

(True/False)

4.9/5

(69)

Question 44

In the Drake equation (Number of Civilizations = NHP × f_life × fciv × f_now, we expect the term fcivto be small if ________.

(Multiple Choice)

4.9/5

(89)

Question 45

We have already launched a spacecraft bound for Alpha Centauri.

(True/False)

4.8/5

(94)

Question 46

Which of the following statements best reflects our current knowledge about the term ( f_life in the equation Number of Civilizations = N HP × ( f_life × f_civilization × f now?

(Multiple Choice)

4.9/5

(73)

Question 47

The habitable zone around a star refers to the places where living organisms are found.

(True/False)

4.9/5

(76)

Question 48

Suppose that Jupiter had never existed, and there was no planet in our solar system between Mars and Saturn. How would we expect this to have affected Earth?

(Multiple Choice)

4.9/5

(78)

Question 49

The only place outside of Earth for which there is irrefutable evidence for ancient, microbial life is

(Multiple Choice)

4.8/5

(84)

Question 50

If we detected an Earth-like planet in the habitable zone around another star, how might we learn whether it harbored life?

(Essay)

4.8/5

(81)

Question 51

SETI (the Search for Extraterrestrial Intelligence) searches for communications from life in planets and moons

(Multiple Choice)

4.8/5

(77)

Question 52

What is a mutation?

(Multiple Choice)

4.8/5

(79)

Question 53

In the Drake equation (Number of Civilizations = NHP × f_life × f_civ × f_now , what do we mean by f_ now?

(Multiple Choice)

4.8/5

(70)

Question 54

Based on DNA studies, it seems that all life on Earth ________.

(Multiple Choice)

4.9/5

(75)

Question 55

Which of the following places is not generally considered a potential home for life in our solar system?

(Multiple Choice)

4.8/5

(94)

Question 56

Which of the following best describes the current status of the debate over evidence for life in the Martian meteorite ALH84001?

(Multiple Choice)

4.9/5

(68)

Question 57

Which of the following best describes natural selection?

(Multiple Choice)

4.8/5

(87)

Question 58

In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico towards a globular cluster, 21,000 light-years away. Approximately how far has this message gotten as of today?

(Multiple Choice)

4.9/5

(75)

Question 59

Which of the following best explains why an interstellar ramjet could, in theory, achieve continuous acceleration?

(Multiple Choice)

4.9/5

(75)

Question 60

Showing 41 - 60 of 82

The "rare Earth hypothesis" holds that Earth-like planets will prove to be quite rare. Which of the following statements best sums up the current status of the debate over this hypothesis?

Why might the presence of a giant planet be both good and bad for life on a terrestrial planet in another solar system?

The analysis of Martian meteorites found on the Earth show that they contain

The requirement of liquid water is the most severe constraint on the development of life.

In the Drake equation (Number of Civilizations = NHP × f_life × fciv × f_now, we expect the term fcivto be small if ________.

We have already launched a spacecraft bound for Alpha Centauri.

Which of the following statements best reflects our current knowledge about the term ( f_life in the equation Number of Civilizations = N HP × ( f_life × f_civilization × f now?

The habitable zone around a star refers to the places where living organisms are found.

Suppose that Jupiter had never existed, and there was no planet in our solar system between Mars and Saturn. How would we expect this to have affected Earth?

The only place outside of Earth for which there is irrefutable evidence for ancient, microbial life is

If we detected an Earth-like planet in the habitable zone around another star, how might we learn whether it harbored life?

SETI (the Search for Extraterrestrial Intelligence) searches for communications from life in planets and moons

What is a mutation?

In the Drake equation (Number of Civilizations = NHP × f_life × f_civ × f_now , what do we mean by f_ now?

Based on DNA studies, it seems that all life on Earth ________.

Which of the following places is not generally considered a potential home for life in our solar system?

Which of the following best describes the current status of the debate over evidence for life in the Martian meteorite ALH84001?

Which of the following best describes natural selection?

In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico towards a globular cluster, 21,000 light-years away. Approximately how far has this message gotten as of today?

Which of the following best explains why an interstellar ramjet could, in theory, achieve continuous acceleration?

Our Place in the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light: the Cosmic Messenger

Formation of Planetary Systems: Our Solar System and Beyond

Earth and the Terrestrial Worlds

Jovian Planet Systems

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Our Star

Surveying the Stars

Star Stuff

Bizarre Stellar Graveyard

Our Galaxy

Galaxies and the Foundation of Modern Cosmology

Dark Matter, Dark Energy, and the Fate of the Universe

The Beginning of Time

Filters