1. What Is C/2025 R2 (SWAN)?

C/2025 R2 (SWAN) is a long-period comet discovered in September 2025 using the SWAN instrument on the SOHO spacecraft.

It’s currently visible with binoculars in the Western Hemisphere, near Mars and the star Spica in Virgo.

Its orbit brings it near Mars, but “near” in space terms still means tens of millions of kilometers away.

2. The “Collision” Claims

Viral posts suggesting a collision with Mars are misleading.

Current trajectory models indicate no risk of impact.

Scientists are monitoring it because it’s an interesting astronomical event, not because Mars is in danger.

3. Why It Feels Terrifying

Comets are dramatic: bright tails, glowing coma, and sudden appearances.

When a comet pᴀsses near a planet, it’s easy for headlines to exaggerate the risk.

In reality, space is vast — even a “close approach” is safe.

4. Why Scientists Track It

Observing comets like SWAN helps astronomers:

Study composition and behavior of long-period comets.

Understand solar system dynamics and comet trajectories.

Learn how planetary atmospheres (like Mars’) interact with dust and solar radiation.