. As the fast radio bursts sailed billions of light-years through conventionally undetectable matter, the waves themselves changed in ways they physically wouldn’t if traveling through a void. That effect on the radio bursts implied a quantifiable “weight” of matter encountered on the long journey, which jibed with cosmological predictions—suggesting intergalactic space contains plenty of sparse, invisible gas clouds.galaxies, but that’s just one part of the missing baryon puzzle.
In 2019, Murphy worked on an unrelated investigation of the radio wave aftermath of the merging of two neutron stars. The team used ASKAP to scan a tract of the cosmos nine and 33 days after the merger. But after Encouraged, Wang and Murphy collected more snapshots of the scintillating signals over 11 months—seven nights of observation in all. That timespan let them tease out the size and shape of what they believe to be an interfering gas cloud, as the backlights shifted in relation to Earth, the first example of such an approach. Their results show that the filament of gas is thin and about a third of one light-year long—20,000 times longer than Earth’s distance from the Sun.
One aspect of the cloud stumped Murphy’s team. She says only warm charged gas, plasma, could cause the twinkling. But based on her team’s models, they think the cloud could form its shape only by moving fast—about 30 kilometers per second—and that means that a larger portion of it would actually be very cold. So cold, in fact, that hydrogen droplets inside could freeze like snowflakes.
Long-standing* my loves ❤️
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