A characteristic that helps an organism survive and reproduce in its environment.

The branch of biology that investigates the possibility of life elsewhere in the universe.

A mixture of gasses that surround a planet, moon, or other space object.

The science dealing with the chemistry of living matter.

The process by which some organisms use C6H12O6 and O2 to produce CO2 and H2O and ATP (cell energy).

The ability to cause change.

Organisms that live in extreme environments.

A force of attraction between objects that is due to their masses.

A phenomenon in which the atmosphere of a planet traps radiation emitted by its sun, caused by gases such as CO2, H2O vapor, and CH4 that allow incoming sunlight to pass through but retain heat radiated back from the planet's surface.

The maintenance of a constant internal state in a changing environment.

The path that a body follows as it travels around another body in space.

A gas molecule that is made up of three oxygen atoms (O3).

The process by which some organisms use CO2 and H2O and Sunlight to produce C6H12O6 and O2.

A relatively large spherical body that orbits a star.

The sun and all of the planets and other bodies that travel around it.

Solar radiation that has the ability to harm life, by damaging the genetic material in organisms.