SUMMARY: A new instrument called Exoplanet Tracker has turned up an extrasolar planet orbiting a star 100 light years away. This instrument is designed to detect subtle shifts in starlight as a star moves back and forth through interactions with its planet. The Exoplanet Tracker is much cheaper than traditional spectrographs, costing only $200,000, and capable of being installed on lower power telescopes. Although this version can only watch one star at a time, future improvements should allow it to monitor 100 stars simultaneously.
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