To explore the surface of Mars

To study the formation and evolution of planets

To detect gravitational waves

To map the Milky Way galaxy

By detecting radio waves from the planet

By measuring the planet's temperature

By analyzing the star's light absorbed by the planet's atmosphere

By observing the planet's magnetic field

To map the universe's expansion

To detect black holes

To measure the speed of light

To understand the chemical compositions of new and old discs

Did Earth's oceans form from volcanic activity?

Did Earth's oceans arrive by impacts with small icy bodies?

Are Earth's oceans shrinking over time?

Are Earth's oceans unique in the solar system?

Titan

Io

Ganymede

Europa