Narrator: As the solar system grew, four rocky planets: Mercury, Venus, Earth and Mars, were created closest to the Sun. Made of rocks and metals, they have solid surfaces and a central core of ...

At the planet's heart lies the inner core, a solid sphere of iron and nickel ... and volcanoes. But unlike its rocky siblings, almost 70 percent of Earth's surface is covered in oceans of liquid ...

Mars may have a solid inner core within its liquid outer core, according to a new analysis of the planet’s seismic activity. This could help solve several enigmas about Martian geology – but ...

for delving into the molecular composition and physical conditions of the warm gas and dust crucial to terrestrial planet formation Universal Processes in Rocky Planet Formation The composition of ...