Exam 19: 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?

Which of the following statements about matter- antimatter engines is not true?

Looking for an Earth- size planet around a nearby star (besides the Sun)is like looking for a pinhead located .

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

Which of the following describes a major challenge of interstellar travel at near light speed?

Which of the following is considered by biologists to be a likely place where life might have first arisen on Earth?

Which of the following was the most important for maintaining the Earth's stable climate over the time it took for large organisms to evolve?

Which of the following statements about matter- antimatter engines is not true?

Why do some scientists say that the Moon may have been important for the evolution of life on the Earth?

Why do we need new forms of technology to make it possible to journey to the nearest stars within a human lifetime?

Although antimatter is an interesting theoretical idea, there is no evidence that it actually exists.

The Sun's habitable zone .

How do scientists determine the age of fossils?

After Mars, the next most likely candidates for life in the solar system are