Mars By the Numbers
Mars is the fourth planet from the Sun, and the seventh largest. It''s the only planet we know of inhabited entirely by robots.
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In Depth | Kuiper Belt – NASA Solar System Exploration
Size and Distance The Kuiper Belt is one of the largest structures in our solar system – others being the Oort Cloud, the heliosphere, and the magnetosphere of Jupiter. Its overall shape is like a puffed-up
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RPS 3D Viewer
NASA''s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
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In Depth | Titan – NASA Solar System Exploration
Titan''s atmospheric nitrogen ratio suggests the moon''s building blocks formed early in the solar system''s history, in the same cold disk of gas and dust that formed the Sun (called the protosolar nebula),
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In Depth | Sun – NASA Solar System Exploration
In Depth The Sun is a 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium – at the center of our solar system. It''s about 93 million miles (150 million kilometers) from Earth and
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In Depth | Earth''s Moon – NASA Solar System Exploration
Because Earth is moving as well – rotating on its axis as it orbits the Sun – from our perspective, the Moon appears to orbit us every 29 days. Structure Earth''s Moon has a core, mantle, and crust. The
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In Depth | Europa – NASA Solar System Exploration
Formation Jupiter''s large Galilean moons – Io, Europa, Ganymede, and Callisto – likely formed out of leftover material after Jupiter condensed from the initial cloud of gas and dust surrounding the sun,
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The Sun By the Numbers
The Sun is the star at the heart of our solar system. Its gravity holds the solar system together, keeping everything – from the biggest planets to the smallest bits of debris – in its orbit.
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In Depth | Our Solar System – NASA Solar System Exploration
The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy. Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury,
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