Astronomers using ESO's Very Large Telescope (VLT) have discovered that the composition of SDSS J102915+172927 (the faintest star in the constellation of Leo - the lion) is mainly hydrogen and helium, with only very small amounts of any heavier elements. Conventional theories of stellar evolution say that it should not exist.
Read the full details at ESO - eso1132 - The Star That Should Not Exist
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