Young star HR 8799, infrared Spitzer Space Telescope image. This star, located 129 light-years from Earth in the constellation Pegasus, has a giant halo of very fine dust (white to red) around it. It is thought that the three large planets known to orbit the star are disturbing small comet-like bodies, causing them to collide and kick up dust. The extended dust halo has a diameter of about 2,000 astronomical units, or 2,000 times the distance between Earth and the sun.This image was captured by Spitzer's multiband imaging photometer at an infrared wavelength of 70 microns in January 2009.