Exploring the Possibilities of Alien Life

What is the estivation hypothesis about advanced alien civilizations?

• They have merged with humans.

• They are actively exploring the universe.

• They are living on Earth in disguise.

• They are hibernating to conserve energy.

According to the Gaian bottleneck hypothesis, why might life not survive on many young rocky planets?

• They lack water.

• They are too far from their stars.

• They have unstable climates.

• They are too small.

What role did early life on Earth play in stabilizing the climate, according to the Gaian bottleneck hypothesis?

• It absorbed all the carbon dioxide.

• It increased the planet's gravity.

• It released gases like oxygen into the atmosphere.

• It created a magnetic field.

What is a potential advantage of life existing in underground oceans on icy worlds?

• They have more sunlight.

• They are closer to the sun.

• They are protected from extreme temperatures and radiation.

• They have more landmass.

Why might intelligent life in underground oceans be isolated from the universe?

• They are too small to be detected.

• They have no technology.

• They are too deep to communicate.

• They are uninterested in other life forms.