Interstellar Visitor 3I/ATLAS Shows Possible Third Color Change
Recent observations suggest the interstellar object 3I/ATLAS has developed a faint blueish hue, indicating a possible third shift in its color since discovery. However, previous color changes observed by experts have not persisted.
Discovery and Characteristics
3I/ATLAS, the third confirmed interstellar object passing through our solar system, was first detected moving toward the sun at speeds exceeding 130,000 mph (210,000 km/h) in early July. It is potentially the oldest comet of its type observed, believed to have been ejected from its original star system within the Milky Way more than 7 billion years ago.
Recent Observations and Visibility
After a close approach to Mars in early October, 3I/ATLAS spent several weeks obscured behind the sun relative to Earth. This position made it largely unobservable from the ground, though some orbiting spacecraft maintained visibility. Now, the comet is becoming visible again to Earth-based telescopes.
Color Changes and Brightening Event
The potential new blueish hue follows a rapid and unexpected brightening event of the comet while it was hidden behind the sun. This marks the third indication of color change noted by researchers.
Perihelion Passage
The comet reached its closest approach to the sun, known as perihelion, in October.
"3I/ATLAS may be developing a blueish hue after undergoing a rapid and unexpected brightening event while hidden behind the sun."
Despite the fluctuating colors, none of these changes have proven to be permanent so far.
Summary
3I/ATLAS, an ancient interstellar comet traveling at incredible speeds, has shown a possible third color shift linked to a brightening event, yet these changes remain temporary.