Eta Carinae is one of the most massive stars in our Milky Way, embedded in a huge emission nebula. Because of its high mass it is very unstable and had several outbursts in the past. The star will end up as a supernova eventually.
Canon EOS 20D Modified Canon 20D mounted on a TMB 80mm/F6 + Televue 0.8x reducer/flattener. Halpha ( Astronomik Ha, 13nm): 10x450sec/ISO800; RGB ( IDAS-LPS): 12x300sec/ISO800. Calibration and stacking, averaging, color balancing, sharpening in Images Plus and Photoshop CS2.