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Double comet alert! Comets Lemmon and SWAN will reach their brightest this week — here's how to spot them

Comet Lemmon (C/2025 A6) makes its closest approach to Earth on Oct. 21, about 24 hours after the fainter Comet SWAN (C/2025 ...
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How to see Comet C/2025 R2 (SWAN) shine in the October sky

Comet C/2025 R2 (SWAN) was discovered on Sept. 10 by Ukrainian amateur astronomer Vladimir Bezugly. It has brightened ...

Here‘s how to see a rare green comet this week

Comet C/2025 A6 (Lemmon) is this year’s brightest comet visible from Earth—an icy relic from the solar system’s origins that ...

2 green comets shine bright. How to spot them in the night sky

Comet Lemmon, also designated C/2025 A6, was discovered in January by a telescope scouring the night sky for near-Earth asteroids. Comet SWAN, also known as C/2025 R2, was spotted in September by an ...
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Interstellar Comet 3I/ATLAS Shows "Extreme Negative Polarization". What Does That Mean?

A team of astronomers have presented the first polarimetric observations of interstellar comet 3I/ATLAS, finding that it has extreme negative polarization. On July 1, 2025, astronomers spotted an ...