If Earth had an evil twin, it might look something like the recently-discovered lava-Earth HD 63433d. HD 63433d is a rocky world almost exactly the same size as our Earth, orbiting a star almost ...

The exoplanet has a year lasting just 4.2 Earth days. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Breaking space news, the latest updates on ...

The universe is teeming with planets, and although we've only spotted a tiny fraction of them, science is always advancing. Our catalog of several thousand exoplanets has a new entry today, an ...