A rare solar encounter has put Comet Lemmon in the spotlight, as NASA’s PUNCH mission recorded its tail being disrupted and split by the Sun. The event offers a vivid look at how active space weather can reshape a comet in real time.
The disturbance occurred when Comet C/2025 A6 passed near the Sun in October 2025, at the same time the Sun released a coronal mass ejection, or CME. That blast sent plasma and magnetic fields racing outward into space, creating the conditions for the comet’s tail to be pulled apart.
What PUNCH saw unfold
Data from PUNCH showed the comet’s tail becoming unstable before it eventually broke. NASA said the tail was torn twice, suggesting a direct interaction with the stream of solar plasma.
PUNCH, short for Polarimeter to Unify the Corona and Heliosphere, captured the comet at intervals of four to eight minutes over a three-month period. That long observation window gave scientists a detailed record of how the tail changed as the comet moved through a more violent solar environment.
| Observation | Detail | Scientific value |
|---|---|---|
| Object | Comet C/2025 A6 Lemmon | Shows how a comet responds near the Sun |
| Spacecraft | PUNCH | Captured repeated images over three months |
| Solar event | Coronal mass ejection | Helped disturb and split the tail |
Why the split matters for science
NASA says the event is important not only because it looks dramatic, but because it helps explain how solar activity affects fragile comet structures. The observation shows that a CME can significantly alter a comet when it crosses a region of heightened solar activity.
It also gives researchers a clearer view of how charged particles from the Sun interact with a comet’s tail. From that interaction, scientists can estimate how much pressure the space environment can place on delicate material streaming behind the comet.
Part of the Illuminate visual series
The episode appears in NASA’s Illuminate series, which is produced by Lacey Young and Joy Ng through NASA’s Goddard Space Flight Center. The project is designed to present scientific visualizations in a way that is accessible while still grounded in observational data.
By documenting Comet Lemmon in this way, NASA has shown that changes in a comet’s tail can be tracked in remarkable detail through sustained observation. The result is one of the longest and most complete records of a comet interacting with solar weather.