The sun’s older twin, 250 light-years away

When the sun enters its twilight years, chances are it will look just like HIP 102152.

In terms of mass, temperature and chemical composition, the star HIP 102152 is the closest match to the sun ever found, astronomers announced August 28 at a press conference. But it’s also almost 4 billion years older, providing a tantalizing glimpse of what might happen to our 4.6-billion-year-old