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Title: Super-Earth Exoplanets Orbiting HD 40307
Caption: Artist's impression of the trio of super-Earths discovered by an European team using the HARPS spectrograph on ESO's 3.6-m telescope at La Silla, Chile, after 5 years of monitoring. The three planets, having 4.2, 6.7, and 9.4 times the mass of the Earth, orbit the star HD 40307 with periods of 4.3, 9.6, and 20.4 days, respectively. Release date June 16, 2008.
Category: Astronomy & Space
Credit: Album / Science Source / European Southern Observatory
Image size: 4350 × 3166 px | 39.4 MB
Print size: 36.8 × 26.8 cm | 1712.6 × 1246.5 in (300 dpi)