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NASA's Hubble Space Telescope has captured an incredible picture of a super-massive star called Eta Carinae exploding in slow motion. The spectacular shot, captured using Hubble's Wide Field Camera 3, includes ultraviolet light and shows the star's hot, expanding gases glowing in red, white and blue. Eta Carinae is the largest member of a double-star system, and is thought to have initially weighed more than 150 Suns. The explosion began 170 years ago, when Eta Carinae went through a titanic outburst, called the Great Eruption, making it the second-brightest star visible in the sky for over a decade. Eta Carinae was so bright that for a time it became an important navigational star for mariners in the southern seas. The star has faded since that eruption and is now barely visible to the naked eye. For decades, astronomers have speculated about whether it is on the brink of total destruction. But the fireworks aren't over yet because Eta Carinae still survives. The celestial outburst takes the shape of a pair of ballooning lobes of dust and gas and other filaments that were blown out from the star. The blue colour comes from the ultraviolet-light glow of magnesium embedded in warm gas. However, astronomers studying the image were surprised to discover the gas in places they had not seen it before - in the space between the dusty bipolar bubbles and the outer shock-heated nitrogen-rich filaments (shown in red). "We've discovered a large amount of warm gas that was ejected in the Great Eruption but hasn't yet collided with the other material surrounding Eta Carinae," said Nathan Smith of Steward Observatory at the University of Arizona in Tucson, Arizona. "Most of the emission is located where we expected to find an empty cavity. This extra material is fast, and it 'ups the ante' in terms of the total energy for an already powerful stellar blast." The newly revealed gas is important for understanding how the eruption began, because it represents the fast
2019-07-01
Cover Images/East News
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