Type Ia Supernova in EXTREMELY distant Galaxies
Exhaustive searches for Type Ia supernova have been going for several years now. This is an example of a supernova discovered in a galaxy a billion light years away.
Note the name of the supernova: 1998ba.. 1998a is the first SN discovered in 1998. 1998aa would be the 25th. 1998ba was the 49th supernova discovered in 1998, and many more were discovered before the end of the year. In the last few years, typically over one HUNDRED supernova are discovered each year due to concentrated efforts to determine distances to galaxies.