The comet C/2022 E3 (ZTF) has just completed it's turn around the Sun and is now heading back towards the outer regions of our solar system. On it's way it will still pass us at it's closest (42 million km) on it's path just a bit over a week from now.
The comet was only found less than a year ago. This is the first time in recorded history a human has seen it. Although our early ancestors might have noticed it last time it visited us 50 000 years ago, but that's highly unlikely as it's barely visible to the naked eye at it's best.
This might also be the last time it will visit the inner solar system. Some calculations shows in unbound to the solar system and this could be it's last trip around the sun before it escapes it. Another option could be that it would return in some millions of years. An unique opportunity for us indeed.