Astronomy Charts posters and art prints store online. Buy your image unframed: click the image. Buy your image framed: click the "Framed" link. Choose from a large selection of frame styles and matching mat colors. Buy your image mounted: click the "Mounted" link. The mounting process permanently bounds images to 1/8" stabilized hardboard. The surface is treated to protect against moisture, dust, dirt, fingerprints, and protects against UV comparable to standard glass. Tip: Save on shipping - buy more than one poster.