A new world is born

摘要

Astronomers have identified a planet in the making. The variable brightness of GM Cephei - a 4-million-year-old star 870 parsecs away - has been noted for decades. But whether that variability is caused by bursts of light from the star or by an object in the disk of dust that surrounds it has been a matter of debate. Wen-Ping Chen at the National Central University in Jhongli, Taiwan, and his team argue for the latter.