ADAM BLOCK / SCIENCE PHOTO LIBRARY ADAM BLOCK / SCIENCE PHOTO LIBRARY
Antares/Rho Ophiuchi region, optical image. This colourful region lies in the constellations Scorpius and Ophiuchus. The blue area at upper right is the triplet star Rho Ophiuchi, embedded in the reflection nebula IC 4604. This nebula does not emit light of its own, but reflects light from the star and appears blue due to blue light being scattered more than red light. The large orb at lower left is the supergiant star Antares (Alpha Scorpii), next to the yellow emission nebula IC 4606. This nebula emits light due to its gas and dust clouds being ionised by radiation from the stars. At right is the star Sigma Scorpii with its pink emission nebula Ced 130, and at lower right is the dense globular star cluster M4 (NGC 6121).
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