[DSRP Evidence](https://dsrpevidence.org/)

# Numerous bow shocks in the outer Helix Nebula

## Details

**Authors** van Dokkum et al.

**Year** 2026

**Publisher** Nature

**Discipline** Astronomy

[Read it at the publisher](https://doi.org/10.1038/s41586-026-10724-z) 
10.1038/s41586-026-10724-z

## In authors' words

### What they found (results)

Using the MOTHRA telescope, researchers found 22 bow shocks in the outer Helix Nebula where fragments of the dying star's ejecta collide with interstellar gas; the shocks' radius of curvature shrinks roughly 100-fold with distance, and debris clumps lose coherence on a ~10,000-year timescale.

## Commentary

### In short

The bow shocks are the direct signature of ejecta fragments (parts) colliding with the interstellar medium (R), and their loss of coherence over ~10,000 years marks the transition of a once-integrated stellar-ejecta whole into diffuse galactic material (S).

**Patterns it shows** S, R

**Added** 2026-08-17

**How to cite this** van Dokkum et al. (2026). Numerous bow shocks in the outer Helix Nebula. Nature.