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Helio and You: Studying Eclipses Near and Far
8 min read

Here on Earth, we're lucky to get total solar eclipses from time to time. But did you know that eclipses…

Aug 7, 2026
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TRAPPIST-1 e — Guided Tour-es
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Dec 15, 2025
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The Exoplaneteers
1 min read
Sep 28, 2025
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TRAPPIST-1 e — Explore the Surface
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Sep 27, 2025
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TRAPPIST-1 e — Guided Tour
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Sep 27, 2025
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Exoplanet Travel Bureau
1 min read

Even the closest exoplanets are too far away to visit...but what if they weren't? Imagine exoplanet tourism — choose your…

Sep 12, 2025
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Webb’s Exoplanet Research Sounds Like Sci-Fi—But It’s Real
21 min read

Some exoplanets—like a gas giant with rain made of glass and 5,000-mile-per-hour winds—sound like worlds dreamed up by a science…

Sep 2, 2025
For Seven Earth-Sized Planets, a Question of Habitability
2 min read

They might make up the most famous planetary system beyond our own: the TRAPPIST-1 star and its seven small, rocky…

Jun 3, 2025
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Other Stars, Other Worlds
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How different is our solar system from others in the Milky Way? And how much are we alike? This five-part…

Jun 3, 2025
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Our Milky Way Galaxy: How Big is Space?

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New Apps: ‘NASA Selfies’ and TRAPPIST-1 VR

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Two Telescopes Reveal Clues to TRAPPIST-1 Planet Compositions, Atmospheres

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New Clues to TRAPPIST-1 Planet Compositions, Atmospheres

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This graph presents measured properties of the seven TRAPPIST-1 exoplanets.
This artist concept shows what the TRAPPIST-1 planetary system may look like, based on available data about the planets diameters, masses and distances from the host star.
This illustration shows the seven TRAPPIST-1 planets as they might look as viewed from Earth using a fictional, incredibly powerful telescope. The sizes and relative positions are correctly to scale.
This chart shows, on the top row, artist conceptions of the seven planets of TRAPPIST-1 with their orbital periods, distances from their star, radii and masses as compared to those of Earth. The bottom row shows data about Mercury, Venus, Earth and Mars.
Three possible interiors of the TRAPPIST-1 exoplanets. All seven planets have very similar densities, so they likely have a similar compositions.
All seven planets discovered in orbit around the red dwarf star TRAPPIST-1 could easily fit inside the orbit of Mercury, the innermost planet of our solar system.
Detailed measurements of the physical properties of the seven rocky TRAPPIST-1 planets and the four terrestrial planets in our solar system help scientists find similarities and differences between the two planet families.
The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. This artist concept appeared on the cover of the journal Nature in Feb. 23, 2017 announcing new results about the system.
This illustration shows the seven Earth-size planets of TRAPPIST-1. The image does not show the planets' orbits to scale, but highlights possibilities for how the surfaces of these intriguing worlds might look.
Three of the TRAPPIST-1 planets dwell in their star so-called habitable zone, shown in green. This is the band around the star where temperatures are just right, not too hot, not too cold, for liquid water to pool on the surface of an Earth-like world
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