Exam 19: Life in the Universe: Are We Alone

What is an organic molecule based on? Why are they important?

What encouragement for life on Mars came from the Global Surveyor?

We believe binary stars to be the _ _ likely to have an extraterrestrial civilization.

We have found Titan's surface to have perfect living conditions for Earthlike life.

What three classes of stars are most likely to house life like ours? Why?

The Miller- Urey experiment did produce amino acids and proteins.

In the habitable zone, surface water must be at least partially

What important molecules of life did Miller and Urey brew up?

The probes sent out of our solar system were carefully designed to hide any trace of their origin.

Single- celled life ruled the Earth from to billion years ago.

What is meant by the "habitable zone"?

Considering both longevity and luminosity, which of these stars would be the most likely candidate for seeking extraterrestrial intelligence?

A Martian meteorite has revealed carbonate rocks and microfossils.

What is the "water hole"? Why is so promising to radio astronomers?

The Milky Way Galaxy is forming about ten stars per month.

Due to the first strong commercial radio stations, our radio presence has now extended out to approximately 70 light-years.

The Miller- Urey experiment relied on special conditions found only on Earth.

What is the primary determinant of whether a planet resides in the "habitable zone" of a planetary system?

Conducted in 1953, the experiments were designed to show what types of complex molecules might have formed in the Earth's primitive environment.

The Murchison meteorite in Australia was found to contain .