After examining potentially habitable climates of three exoplanets, two seem to use an air-condition-like system that prevents the planet from getting too hot, according to KU Leuven researchers.
It is well known that brightness drives our circadian rhythms, but for the first time new research shows that the body's internal clock also depends on the color of light to measure the time of day.
We certainly know how long our own day is, and Mars is not much longer (24 hours and 40 min). The closest planet to the Sun, Mercury's own incredibly long day lasts more than 1,407 hours. What's interesting, however, is that astronomers know all this with near certainty. That's not the case for Saturn, on the other hand, whose day length has remained something of an enigma.