A mysterious, uninvited guest has been spotted shooting through the solar system at breakneck speed. And, for the first time, you can now see this interstellar visitor barreling towards us for yourself — thanks to a free livestream from the Virtual Telescope Project, taking place on Thursday (July 3).
The newly discovered interloper, initially dubbed A11pl3Z, was revealed to us on Tuesday (July 1), when researchers spotted it in data collected by the Asteroid Terrestrial-impact Last Alert System (ATLAS), which automatically scans the night sky using telescopes in Hawaii, Chile and South Africa.
The mysterious object is traveling toward the sun at around 152,000 mph (245,000 km/h), and it is set on a very flat and straight trajectory, unlike any other known object in our solar system.
Many experts initially predicted that it was an interstellar object, meaning it originates from beyond the sun's gravitational influence and has enough momentum to shoot straight through our cosmic neighborhood without slowing down. On Wednesday (July 2), NASA confirmed this and revealed that the interloper is most likely a comet. It has now been officially named 3I/ATLAS.
The extrasolar entity is too faint to be visible to the naked eye or through amateur stargazing equipment, although it may brighten sufficiently to become visible to backyard telescopes in the coming weeks and months. However, the upcoming livestream from the Virtual Telescope Project (VTP) will share the view from VTP's powerful telescope in Manciano, Italy.
The livestream will begin at 6:00 p.m. ET on July 3 and can be viewed on the VTP's YouTube channel.
Only two other confirmed interstellar visitors have ever been spotted before now: Comet 2I/Borisov, which was seen shooting through the solar system in 2019; and 'Oumuamua, a cigar-shaped object that made headlines in 2017 when some astronomers argued it was potentially an alien probe, before experts showed it was most likely a hydrogen-spewing space rock. However, scientists suspect that many more interstellar interlopers likely pass through our cosmic neighborhood undetected.
3I/ATLAS is believed to measure up to 12 miles (20 kilometers) across and is currently around 4.5 times as far from the sun as Earth is. It will reach its closest point to the sun, known as perihelion, on Oct. 30, coming within 1.4 Earth-sun distances, or astronomical units (AU), of our home star. Shortly before this happens, the comet will also make its closest approach to Mars, coming within 0.4 AU of the Red Planet.
Earth will be on the opposite side of the sun to 3I/ATLAS during the comet's solar flyby. The object will likely make its closest approach to Earth in December, on its journey back out of the solar system. As a result, "the comet poses no threat to Earth and will remain at a [minimum] distance of at least 1.6 astronomical units," NASA officials wrote in a statement.
Astronomers are now racing to learn more about the rare object before it leaves the solar system at some point next year. Researchers will be able to study it until the end of September, when it will become obscured by the sun's light, and again from December, when the comet reemerges from behind our home star.
The interstellar visitor will likely be imaged by the Vera C. Rubin Observatory — the world's most powerful optical telescope, which recently released its first images.
Some researchers have also suggested using the James Webb Space Telescope and NASA's Mars rovers to photograph the object as it shoots toward the sun.
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