Illustration (IMAGE) Simons Foundation Caption An artist’s impression of the planet Janssen, which orbits its star so closely that its entire surface is a lava ocean that reaches temperatures of around 2,000 degrees Celsius. Credit ESA/Hubble, M. Kornmesser Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.