Space is Colder Than We Hoped
Any device, from a toaster to a smartphone, heats up when operating. This is the inevitable result of energy conversion — there's always a heat trace left, like a hot stove burner after cooking.
A Quiet Ear on the Far Side of the Moon
On Earth, the radio spectrum is clogged with signals: communications, television, radar. But on the far side of the Moon, it's quiet. There, Earth's noise is inaudible, and that's exactly where China's Chang'e-4 went to listen to the cosmos for the first time, hunting for alien radio transmissions.
Scientists processed the recordings from its antennas.