Why is Venus hotter than Mercury, when Mercury is closer to the Sun?
“Why is Venus the hottest planets, whereas Mercury is closer to the Sun?” — Sejal M., age 7, Bangalore, India When the solar system had just formed, 4.5 billion years ago, Venus was probably a tropical paradise. Oceans of water likely covered its surface, and puffy clouds dotted its skies. At that time, Mercury, the …