Outer Space

Betelgeuse has been a beacon in the night sky for stellar observers, but it began to dim late last year. At the time of writing, Betelgeuse is at about 36 percent of its normal brightness, a change noticeable even to the naked eye. (Image: ESO)

ESO Telescope Sees Surface of Dim Betelgeuse

Using ESO’s Very Large Telescope (VLT), astronomers have captured the unprecedented dimming of Betelgeuse, a red supergiant star in the constellation of Orion. The stunning new images of the star’s surface show not only the fading red supergiant, but also…

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ESO Telescope Sees Surface of Dim Betelgeuse

Using ESO’s Very Large Telescope (VLT), astronomers have captured the unprecedented dimming of Betelgeuse, a red supergiant star in the constellation of Orion. The stunning new images of the star’s…

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Ghosts of Ancient Explosions Live on in Stars Today

When small, dense stars called white dwarfs explode, they produce bright, short-lived flares called Type Ia supernovae. These supernovae are informative cosmological markers for astronomers — for example, they were…

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New Water Cycle on Mars Discovered

Approximately every two Earth years, when it is summer on the southern hemisphere of Mars, a window opens: Only there and only in this season can water vapor efficiently rise…