Astronomer Gianluca Masi and his Virtual Telescope Project will host a special livestream on Oct. 24 beginning at 1:30 p.m. EDT (1730 GMT) to watch as both comets make a close pass to Earth, making them well placed for observations.

Comet C/2025 A6 (Lemmon) is this year’s brightest comet visible from Earth—an icy relic from the solar system’s origins that won’t return until the next millennium.

Comet Lemmon (C/2025 A4) will make its closest approach to Earth on November 8th, and is currently visible to the naked eye in dark locations away from light pollution.

After a year devoid of comets visible to the naked eye, two of the celestial entities — C/2025 A4 (Lemmon) and C/2025 R2 (SWAN) — will be gracing our skies at around the same time. Lemmon will reach its closest point to Earth on Tuesday, October 21st, wherein will come within about 56 million miles from Earth, according to Livescience.

Recently, scientists discovered a number of new comets, two of which will be passing by Earth in October. Here's everything you can expect to find in the skies.

Comet SWAN will be visible only in early evenings after sunset, while Lemmon can be seen just before sunrise. However, both comets appear near the Sun from Earth's perspective, giving a small window each day to spot them. The two celestial bodies look similar in images, with green gas clouds and long tails trailing behind them.

A rare opportunity to see not one but two comets awaits skygazers this October. We show where and how to view them.

A newly discovered comet is about to make its closest pass to Earth on Tuesday night. It should be visible over the Bay Area before it disappears — and won’t be seen again for more than a thousand years.