One is a rocky planet 1.5 times the size of Earth. The other is a gaseous world nearly four times Earth’s size. Together they form a spectacular system in which two planets orbit closer to each other than any yet discovered.
One is a rocky planet 1.5 times the size of Earth. The other is a gaseous world nearly four times Earth’s size. Together they form a spectacular system in which two planets orbit closer to each other than any yet discovered.