Left: NASA Spitzer image showing the portion of the Rho Oph dark cloud observed with HAWC+ instrument. Right: HAWC+ image showing systematic variations of the far-infrared polarization spectrum in the interstellar cloud.
![Rho Oph dark cloud observed with HAWC+](https://ciera.northwestern.edu/wp-content/uploads/2020/01/aas-press-release_r_oph-_side_image-1-1024x463.png)
Credit: NASA/JPL-Caltech/Harvard-Smithsonian CfA. SOFIA/ HAWC+/ Northwestern University /F. Pereira Santos
- Science