The final image sent by doomed Japanese Hitomi satellite
A doomed Japanese satellite managed to capture a view of a galaxy cluster 250 million light years away just before it died, scientists have revealed, the BBC reports.
Launched in February, the Hitomi X-ray satellite began tumbling out of control in March and contact was finally lost.
Just before its demise, scientists managed to extract data measuring X-ray activity in the Perseus galaxy cluster.
Published in Nature, data revealed the movement of gas between galaxy clusters was not as turbulent as expected.
Hitomi, which translates as the pupil of the eye in Japanese, was meant to spend years studying the formation of galaxy clusters and the warping of space and time around black holes.
It cost more than a quarter of a billion dollars and was a joint project with NASA and others.
Scientists studying the data found that the hot gases between galaxies within the Perseus cluster was travelling at a slower speed - at 540,000 km/h (340,000 mph) - and in a less turbulent way than many expected.
Measuring the turbulence and movement of such gas is important because the size of galaxy clusters is a useful tool for measuring "the parameters of cosmology and the growth of structure in the universe", researchers say.
The gases in galaxy clusters are thought to be particularly hot and dense with a lot of dark matter and a supermassive black hole at the centre of it all. The interaction between all the various gases was thought to be very chaotic so Hitomi's observations appear to have defied predictions.
"The gas is relatively stable and isn't getting pushed around as much as we thought," said Brian McNamara, a professor of physics and astronomy at the University of Waterloo in Ontario, who was part of the research team.
"Hitomi's Perseus observation tells us that we can probably weigh distant galaxy clusters to greater accuracy than we can weigh our own Milky Way galaxy."
Hitomi was lost thanks to a sensor incorrectly detecting a roll in the spacecraft. In trying to correct it, on-board systems sent the craft into a spin until finally the solar panels that powered it are thought to have broken off.
The next time a similar satellite will be launched is in 2028 by the European Space Agency.
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