Astronomers have uncovered a pair of giant planets that are lighter than cotton candy. The two so-called super-puffs are the size of Jupiter — the biggest worlds found so far to have less density than ...

Five a.m. and my eyes are open. I tap the screen of my phone, strategically poised on my nightstand and ready to wake me in 15 minutes. I don’t need its alarm. I know today is the day I have planned ...