* Astronomy Picture of the Day: Tycho's Supernova Remnant* solstation.com: Tycho's Star* The Search for the Companion Star of Tycho Brahe's 1572 Supernova* cnn.com: Important days in history of universe
==See also==* List of supernova remnants==References====External links==* Astronomy Picture of the Day: Tycho's Supernova Remnant* solstation.com: Tycho's Star* The Search for the Companion Star of Tycho Brahe's 1572 Supernova* cnn.com: Important days in history of universe