One comet will be visible from Earth every 50,000 years.

For the first time in 50,000 years, a comet will pass by Earth and the Sun in the next weeks, and it may be visible to the unaided eye.
On February 1, the comet is predicted to pass closest to Earth. If the sky is clear of city lights or the moon, it will be simple to see the comet without binoculars or even with them.
The comet, which is thought to be around a kilometer in diameter and is composed of ice and dust, emanates a greenish halo.
According to Nicolas Biver, an astrophysicist at the Paris Observatory, the new Moon on January 21–22 provides a wonderful opportunity for astronomers as a bigger Moon may make it challenging to see it.
The California-based Zwicky Transient Facility, which first noticed the comet past Jupiter in March of last year, gave it the name C/2022 E3 (ZTF).
According to Biver, the comet is composed of ice and dust and has a bluish-green glow.
It is thought to be around a kilometer in circumference. That makes it substantially smaller than Hale-Bopp, which raced by in 1997 with a diameter of around 60 kilometers, and NEOWISE, the last comet observable with the unaided eye, which passed Earth in March 2020. (37 miles).
However, Biver said that the most recent journey will be closer to Earth, which "may make up for the fact that it is not particularly huge."
The object might possibly be twice as brilliant as anticipated, he continued, giving us a pleasant surprise.
It is thought to be around a kilometer in circumference. That makes it substantially smaller than Hale-Bopp, which raced by in 1997 with a diameter of around 60 kilometers, and NEOWISE, the last comet observable with the unaided eye, which passed Earth in March 2020. (37 miles).
However, Biver said that the most recent journey will be closer to Earth, which "may make up for the fact that it is not particularly huge."
The object might possibly be twice as brilliant as anticipated, he continued, giving us a pleasant surprise.
The James Webb Space Telescope will be one of those paying careful attention. The astronomer claimed that instead of taking pictures, it will instead analyze the make-up of the comet.
At the Zwicky Transient Facility, Thomas Prince, a professor of physics at the California Institute of Technology, explained to AFP that the comet's closeness to the Earth made it simpler for observatories to determine its composition "when the Sun melts off its outer layers."
He continued, saying that this "unique visitor" will provide "us with knowledge on the inhabitants of our solar system much beyond the most distant worlds."
On February 10, when it will pass quite close to Mars, there will be a second opportunity, according to Prince, to find the comet in the sky.

