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www.planetary.org
The Sun, our Solar System’s star | The Planetary Society
We study the Sun to learn about how stars work, and to help protect our civilization from solar storms.
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Our Sun NASA's Solar Dynamics Observatory captured this view of the Sun in 2016. NASA / SDO / AIA, EVE, and HMI science teams / Edited by The Planetary Society
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What Is the Habitable Zone? - The Planetary Society
Our solar system’s habitable zone While each planet in our solar system is unique, the 8 planets can generally be grouped into two different categories: the inner rocky planets (Mercury, Venus, Earth, and Mars) and th...
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Is Planet X/Planet Nine real? - The Planetary Society
Apr 2, 2024 · The predicted orbit is about 20 times farther from our Sun on average than Neptune, taking between 10,000 and 20,000 years to orbit the Sun. Neptune, by comparison, completes an orbit roughly every 165 y...
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Earth, our home planet - The Planetary Society
Earth, the only planet known to support life, offers liquid water, an oxygen-rich atmosphere, and protection from the Sun’s harmful radiation.
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“We’re made of starstuff.” What does that… | The Planetary...
Nov 9, 2025 · In the cores of stars, intense pressure and heat fuse hydrogen atoms together to make helium — the same process that powers our Sun today. When hydrogen in the core is used up, some stars begin fusing he...
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Solar System History 101 - The Planetary Society
Jan 14, 2021 · Our solar system is a wondrous place. Countless worlds lie spread across billions of kilometers of space, each dragged around the galaxy by our Sun like an elaborate clockwork. The smaller, inner planet...
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A map of our location in the galaxy Our Sun lies in the disk, halfway between the center and the edge. The halo is not depicted, but is a spherical, low-density cloud of stars which extend into and out of the page.
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Venus, Earth's twin sister | The Planetary Society
Venus is also called the "morning star" and "evening star" because it appears relatively close to the Sun in the sky, shortly after sunset or before sunrise. Since Venus is the brightest planet as seen from Earth's su...
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Meet the Solar System's five official dwarf… | The Planetary...
Apr 19, 2023 · Our Solar System is filled with diverse and wondrous worlds. From asteroids to gas giants, we’ve sent spacecraft to objects of all shapes and sizes, yet there is still much more to explore. Among the me...