Browse Archive

  • Star called CW Leo

    Plowing Through the Depths of Space

    A runaway star, plowing through the depths of space and piling up interstellar material before it, can be seen in this ultraviolet image from NASA’s Galaxy Evolution Explorer. The star, called CW Leo,...

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  • Helix nebula

    Helix Nebula

    This is the Helix nebula, as seen in ultraviolet light. It is a star like our sun but at the very end of its life. The star is a small dot in the center, surrounded by billowy layers of expelled mater...

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  • Andromeda galaxy, or M31

    The Galaxy Next Door

    Hot stars burn brightly in this new image from NASA's Galaxy Evolution Explorer, showing the ultraviolet side of a familiar face.

    At approximately 2.5 million light-years away, the Androm...

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  • Cartwheel galaxy

    Cosmic Cartwheel of Color

    This image of the Cartwheel galaxy shows a rainbow of multi-wavelength observations from NASA missions, including the Galaxy Evolution Explorer (blue), the Hubble Space Telescope (green), the Spitzer ...

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  • Galaxy sprouts stars far from its central hub

    Star Formation in the Suburbs

    A galaxy sprouts stars far from its central hub, as seen here where the blue dots line the red, spindly, spiral arms. Ultraviolet data from the Galaxy Evolution Explorer are color-coded blue and green...

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  • Spiral galaxy NGC 1512

    It Takes Two to Tango

    Astronomers suspect that this pair of galaxies is locked in a gravitational dance. In this ultraviolet image, a spiral arm from the central galaxy appears to be wrapped around the smaller galaxy, loca...

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  • Galaxy NGC598, more commonly known as M33

    Dissecting a Galaxy

    By combining ultraviolet data from the Galaxy Evolution Explorer with infrared observations from NASA's Spitzer Space Telescope, astronomers get a clear picture of the various components of a galaxy. ...

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  • 'Ghost of Mirach' galaxy

    Ghostly Galaxy

    These images show the galaxy nicknamed "Ghost of Mirach" in visible-light (left) and in ultraviolet (right) as seen by the Galaxy Evolution Explorer. A ring around the galaxy -- which is the white spo...

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  • Artist's concept showing the development of galaxies

    Watching Galaxies Grow Old

    Observations from the Galaxy Evolution Explorer allowed astronomers to trace the development of galaxies, from their wild, youthful days to their more settled, older years.

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  • Computer-simulated image shows gas from a tidally shredded star falling into a black hole

    Black Hole Swallows a Star

    These images, taken with NASA's Galaxy Evolution Explorer and the Pan-STARRS1 telescope in Hawaii, show a brightening inside a galaxy caused by a flare from its nucleus. The arrow in each image points...

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  • Timeline of NGC 3801

    Timeline of the Rise and Fall of NGC 3801

    Astronomers believe they have caught the galaxy NGC 3810 at a critical point in its history, just as it is making the transition from a vigorous spiral galaxy to a quiescent elliptical galaxy whose st...

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  • galaxy NGC 3801

    The Beginning of the End of Star Formation

    Time is running out for the galaxy NGC 3801, seen in this composite image combining light from across the spectrum, ranging from ultraviolet to radio. NASA's Galaxy Evolution Explorer and other instru...

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  • Cygnus Loop Nebula

    Cygnus Loop Nebula

    Wispy tendrils of hot dust and gas glow brightly in this ultraviolet image of the Cygnus Loop nebula, taken by NASA’s Galaxy Evolution Explorer. The nebula lies about 1,500 light-years away, and is a ...

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  • This diagram illustrates two ways to measure how fast the universe is expanding.

    How to Measure the Universe

    This diagram illustrates two ways to measure how fast the universe is expanding. In the past, distant supernovae, or exploded stars, have been used as "standard candles" to measure distances in the un...

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  • In this artist's conception, dark energy is represented by the purple grid above, and gravity by the green grid below

    Dark Energy and Gravity - Yin and Yang of the Universe

    Astronomers think that the expansion of the universe is regulated by both the force of gravity, which acts to slow it down, and a mysterious dark energy, which pushes matter and space apart. In fact, ...

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  • Postage-stamp images taken by the ultraviolet-sensing telescope on NASA's Galaxy Evolution Explorer.

    Little Galaxies Pack a Big Punch

    NASA's Galaxy Evolution Explorer is helping to solve a mystery -- why do the littlest of galaxies produce the biggest of star explosions, or supernovae?

    These postage-stamp images were ta...

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  • Planets Under a Red Sun

    Planets Under a Red Sun

    This artist's concept illustrates a young, red dwarf star surrounded by three planets. Such stars are dimmer and smaller than yellow stars like our sun, which makes them ideal targets for astronomers ...

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  • Rings and arcs of ultraviolet light around a selection of galaxies imaged by Hubble

    Ultraviolet Ring Around the Galaxies

    Astronomers have found unexpected rings and arcs of ultraviolet light around a selection of galaxies, four of which are shown here as viewed by NASA's and the European Space Agency's Hubble Space Tele...

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  • A star-studded tail in a galaxy called IC 3418

    Now You See a Tail, Now You Don't

    NASA's Galaxy Evolution Explorer found a tail behind a galaxy called IC 3418. The star-studded tail can be seen on the left, as detected by the space telescope in ultraviolet light. The tail has escap...

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  • Diagram illustrating the proportion of small to big stars in certain galaxies.

    Adding up Stars in a Galaxy

    This diagram illustrates the extent to which astronomers have been underestimating the proportion of small to big stars in certain galaxies.