Astronomers working with the VLT and the TNG have discovered a binary star system made up of two white dwarfs which revolve around each other every 5 minutes, the fastest yet known. It's thought that these may be causing gravity waves which can be detected when LISA comes online in 10 years.

• RXJ0806.3+1527: a double degenerate binary with the shortest known orbital period (321s)
• RX J0806+15: the shortest period binary?