... Tonight's Sky . ... Observing . ... exoplanets . ... Sky Events . Get to Know the Night Sky . ... Day and night observed on exoplanet . For the first time, scientists have directly measured day and night temperatures on a planet outside our solar system. ... A Jupiter-like planet orbits close to its host star in this artist's concept of extrasolar planet Upsilon Andromedae b. Scientists who measured the planet's temperature find little energy transport from the exoplanet's day to night side. ...