Last weekend, as I gazed up at a clear summer sky, I couldn’t help but wonder what secrets the cosmos holds. It turns out one of those secrets is racing toward our galaxy’s heart at a staggering 2 000 000 km/h—fast enough to circle Earth roughly every two minutes. Dubbed CWISE J1249+3621, this celestial speedster is forcing astronomers to rethink how objects can achieve such mind-boggling velocities.
Who is CWISE J1249+3621?
At first glance, CWISE J1249+3621 appears on the edge between a star and a brown dwarf, earning it a place among the so-called “failed stars.” Sitting about 400 light-years from Earth, its mass is roughly 8 per cent that of the Sun—about 80 times Jupiter’s weight. Citizen scientists in the “Backyard Worlds: Planet 9” project first flagged the object, using data from NASA’s WISE infrared telescope to unveil faint, fast-moving neighbours of our Sun.
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A breakneck speed
What really caught everyone’s attention is its classification as a hypervelocity object—one that moves too swiftly to remain gravitationally bound to the Milky Way. “It’s the lowest-mass high-speed star we’ve seen,” says Professor Adam Burgasser of UC San Diego. Spectroscopic analysis even revealed unusual chemical fingerprints in its atmosphere, offering tantalising clues about where it might have come from.
Four theories to explain its journey
Astronomers are exploring several scenarios:
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Sagittarius A* ejection: The supermassive black hole at our galaxy’s centre could have flung it outward after a close encounter.
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Binary supernova kick: If it once orbited a white dwarf that exploded, the blast might have acted like a cosmic slingshot, sending the companion rocketing away.
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Interactions in globular clusters: Dense star clusters often harbour smaller black holes; chaotic gravitational tugs here can eject objects at incredible speeds.
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Intergalactic interloper: A more exotic idea suggests it originated outside our Milky Way, though its neatly planar orbit makes this less likely.
Each hypothesis has its merits, and upcoming observations—particularly of its trajectory and composition—should help astronomers zero in on the truth. For now, CWISE J1249+3621 remains a thrilling reminder that the universe still has plenty of surprises up its sleeve.
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Hi, I’m Brandon from the Decatur Metro team. I guide you through the trends and events reshaping our region.
