Two-faced star with helium and hydrogen sides baffles astronomers

[Ursa major]

Astronomers have discovered a two-faced star and are baffled by its bizarre appearance.

The white dwarf appears to have one side composed almost entirely of hydrogen and the other side made up of helium. It is the first time that astronomers have discovered a lone star that appears to have spontaneously developed two contrasting faces.

(From the Grauniad.)