C4 – Hubble Caldwell 4, Iris NebulaAlso called the Iris Nebula, or NGC 7023, Caldwell 4 is of particular interest to astronomers.Image Credit: NASA & ESA Facebook Pinterest X LinkedIn Email https://science.nasa.gov/image-detail/c4/Copy URL to clipboard> DownloadShareTagsHubble Space TelescopeImage CreditNASA & ESASize1024x992px
