Life in the Cosmos

How many of the terrestrial planets have iron cores?

What is the most abundant gas in the atmosphere of Titan?

Unlike the Earth, Venus does not have a protective magnetic field because of its ...

Which terrestrial planet(s) other than Earth have magnetic fields?

Rocks are found on the surface of another planet which appear to have been formed from the solidification of molten lava. Given this, they are most likely to be classified as ...

What is an object composed mainly of dust and ice that comes from the outer solar system towards the Sun?

Layers of sediment that once contained colonies of ancient microbes are called

What is the most abundant element by mass in the human body?

What is the name of the process in which a number of smaller nuclei combine to form a larger nucleus with the release of energy?

What is the approximate lifetime of the Sun (in billions of years)?

Cells that lack a nucleus are called ...

An organism that thrives in physically or geochemically extreme conditions is named an ...

Which EM waves are the most efficient way to communicate between civilizations?

During what period were most of the Moon's craters formed?

What is the most abundant element within nebulae?

The K-T boundary separates which two periods in Earth's history?

The point in a solar system beyond which that hydrogen compounds condense into solid ice grains is known as ...

What is a small rocky body in the Solar System?

The total mass of all existing asteroids is 1/--- of that of the Earth

What temperature is required for the proton-proton cycle to occur?