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  1. STScI Scientists Surprised to Find Brightness ‘Gap’ in Ancient Star Cluster

    June 03, 2026Release ID: 2026-405 Missions: STScI

    Tools developed at STScI for the Hubble Space Telescope were critical to this discovery.

    This astronomical image is speckled with thousands of stars against the black background of space. Most stars are visible only as white pinpoints. The great majority of stars are crowding the image’s center, which appears as an irregular round shape. Most stars in the center of this cluster are whiter, and those along periphery edges yellower. The stars across the entire image range in color from blue to white to yellowish red. A few of the stars appear a bit larger and brighter than the rest, with six diffraction spikes.

  2. Webb Narrows Atmospheric Possibilities for Earth-sized Exoplanet TRAPPIST-1 d

    August 13, 2025Release ID: 2025-120 Missions: Webb

    Could planets orbiting red dwarf stars like TRAPPIST-1 be habitable? Webb scientists say the investigation is ongoing.

    A planet is silhouetted in front of a star. The star shows a large eruption on one side and more wisps of red coming from its southern hemisphere. Two more planets appear in the background.

  3. Webb Rules Out Thick Carbon Dioxide Atmosphere for Rocky Exoplanet

    June 19, 2023Release ID: 2023-125 Missions: Webb

    Infrared measurements of TRAPPIST-1 c indicate that it is probably not as Venus-like as once imagined.

    Illustration of two rocky exoplanets and their active red dwarf star.

  4. Hubble Follows Shadow Play Around Planet-Forming Disk

    May 04, 2023Release ID: 2023-011 Missions: Hubble

    Unseen Newborn Planets Are Stirring Up Dust Around a Young Star

    An artist's concept showing an oblique view of three concentric rings of dust and gas. At the center is a glowing sphere representing the central star. The reddish-colored rings are slightly inclined to each other due to the gravitational pull of unseen planets warping the disk structure. They are therefore casting dark shadows across the outermost ring at the 11 o'clock and 12 o'clock positions.

  5. Webb Finds Water Vapor, But From a Rocky Planet or Its Star?

    May 01, 2023Release ID: 2023-120 Missions: Webb

    More observations will be needed to determine if exoplanet GJ 486 b has an atmosphere.

    Occupying the left two-thirds of the image is a foreground planet mostly in shadow. On the right side, a tan crescent shows subtle surface features. A thin, tenuous blue atmosphere lines the planet’s limb. On the right, a small red globe represents a red dwarf star. Its surface is mottled with small, dark spots resembling sunspots. Both planet and star are on a mostly black background speckled with hundreds of faint, distant stars.

  6. Superflares From Young Dwarf Stars Imperil Planets

    October 18, 2018Release ID: 2018-46 Missions: Hubble

    Energetic outbursts may strip off planet atmospheres

    Superflares From Young Dwarf Stars Imperil Planets

  7. Mini-Flares Potentially Jeopardize Habitability of Planets Circling Red Dwarf Stars

    June 06, 2017Release ID: 2017-23 Missions: Hubble

    Solar flares and associated eruptions can trigger auroras on Earth or, more ominously, damage satellites and power grids. Could flares on cool, red dwarf stars cause even more havoc to orbiting planets, even rendering...

    Mini-Flares Potentially Jeopardize Habitability of Planets Circling Red Dwarf Stars

  8. NASA's Hubble Finds that Puny Stars Pack a Big Punch

    January 10, 2011Release ID: 2011-02 Missions: Hubble

    A survey of more than 200,000 stars in our Milky Way galaxy has unveiled the sometimes petulant behavior of tiny dwarf stars. These stars, which are smaller than the Sun, can unleash powerful eruptions called flares...

    NASA's Hubble Finds that Puny Stars Pack a Big Punch

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