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In Depth | Our Solar System – NASA Solar System Exploration
Most of the hundreds of billions of stars in our galaxy are thought to have planets of their own, and the Milky Way is but one of perhaps 100 billion galaxies in the universe.
In Depth | Sun – NASA Solar System Exploration
Most of the nebula's material was pulled toward the center to form our Sun, which accounts for 99.8% of our solar system’s mass. Much of the remaining material formed the planets and …
Planet Compare - NASA Solar System Exploration
Jun 5, 2025 · NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
The Sun By the Numbers - NASA Solar System Exploration
Jun 5, 2025 · 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 – …
Solar System Exploration
Jun 6, 2025 · Our solar system includes the Sun, eight planets, five officially named dwarf planets, hundreds of moons, and thousands of asteroids and comets. Our solar system is located in …
Pluto By the Numbers – NASA Solar System Exploration
Jun 5, 2025 · Pluto was once our solar system's ninth planet, but has been reclassified as a dwarf planet. It's located in the Kuiper Belt.
RPS 3D Viewer - NASA Solar System Exploration
Jun 5, 2025 · NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
In Depth | Europa – NASA Solar System Exploration
If it can be demonstrated that life formed independently in two places around the same star, it would then be reasonable to suggest that life springs up in the universe fairly easily once the …
Directory - NASA Solar System Exploration
Jun 5, 2025 · NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
Mars By the Numbers - NASA Solar System Exploration
Jun 5, 2025 · Mars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited entirely by robots.