Illustration of the planet 55 Cancri e,also called Janssen.This is an exoplanet orbiting 55 Cancri A.Its mass is thought to be around 8.6 Earth masses,making it a so-called 'Super-Earth'.The planet orbits its star so closely that it completes an orbit in less than 18 hours.Its proximity to its star - only 0.015 astronomical units,or 1 20th of the Mercury-Sun separation - means that the planet is exceptionally hot and likely volcanic,as this depiction shows.

• Contributor: Science Photo Library / Alamy Stock Photo
• Image ID: PT5HF1
• File size: 90.3 MB (1.9 MB Compressed download)
• Releases: Model - no | Property - no
• Dimensions: 6557 x 4815 px | 55.5 x 40.8 cm | 21.9 x 16.1 inches | 300dpi
• Photographer: MARK GARLICK/SCIENCE PHOTO LIBRARY