Light echoes from exploding star
Light echoes from an exploding star. Hubble Space Telescope image of an illuminated dust shell around the star v838 Monocerotis. This star underwent a massive brightening in January 2002, temporarily becoming the brightest star in the galaxy. The light from this outburst reflects from a series of dust shells around the star, which are thought to have been ejected during previous activity. The phenomenon allows study of the fine structure of the dust shells, which could help explain why the star behaves as it does. This image was taken on 8th February 2004 by the Advanced Camera for Surveys.
© NASA/ESA/STSCI/H.BOND/SCIENCE PHOTO LIBRARY
Helix nebula, HST image
Helix Nebula. Hubble Space Telescope image of the Helix planetary nebula (NGC 7293). This comprises shells of gas cast off a Sun-like star near the end of its life. The colours are due to gases in the shells being ionised by radiation from the central star that ejected them. The blue colour comes from oxygen and the red from hydrogen and nitrogen. Despite its ring shape, it is thought that the nebula is actually a cylinder aligned end on to Earth. This is one of the nearest planetary nebulae to Earth, lying 650 light years away in the constellation Aquarius. It is 3 light years in diameter, and appears half a Moon-width wide.
© NASA/ESA/STSCI/C.O'DELL, VANDERBILT U. ET AL/ SCIENCE PHOTO LIBRARY
Red Hermit Crab in its habitat, emerging from its shell
Red Hermit Crab in its habitat, emerging from its shell.
On Home Island, Cocos (Keeling) Islands, Indian Ocean.
Please note that prints are for personal display purposes only and may not be reproduced in any way.
© Don Hadden/ardea.com
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