Splitting double stars can still contribute to science, as the image in our banner illustrates.
Other telescopes had shown this particular star as a single – but as a single it broke all the rules. Calculations had shown that it was twice as big as any star could and should be – but no wonder, it really was two stars as the Hubble Telescope proved by splitting it! Here’s how the space agency explained it in a press release in 2006 – oh, and credit for the image should go to NASA, ESA, and J. Maíz Apellániz (Instituto de Astrofísica de Andalucía, Spain)
The small open star cluster Pismis 24 lies in the core of the large emission nebula NGC 6357 in Scorpius, about 8,000 light-years away from Earth. Some of the stars in this cluster are extremely massive and emit intense ultraviolet radiation. The brightest object in the picture is designated Pismis 24-1. It was once thought to weigh as much as 200 to 300 solar masses. This would not only have made it by far the most massive known star in the galaxy, but would have put it considerably above the currently believed upper mass limit of about 150 solar masses for individual stars. However, high-resolution Hubble Space Telescope images of the star show that it is really two stars orbiting one another (inset pictures at top right and bottom right). They are estimated to each be 100 solar masses. The Hubble Advanced Camera for Surveys images were taken in April 2006.
Wow! The Hubble Space Telescope – now that’s a star splitter!