... Tonight's Sky . ... Observing . ... An artificial comet holds secrets to Earths life . ... solar system . ... Comet crystals found in a nearby planetary system . ... Close-up of olivine crystals seen inside a meteorite found on Earth that originated from a partly melted solar system asteroid. ... In contrast, the olivine crystals found in pristine comets, such as in the material measured in the Beta Pictoris system by ESAт??s Herschel space observatory, are iron-poor but magnesium-rich. ...