DIY Exoplanet DetectorStar Track: The rotation of the Earth causes stars to continuously shift position in the sky. Detecting the subtle signs of the existence of an orbiting exoplanet requires compensating for this shift. To do that, I built my own hinged “barn door” tracker. Since 1995, when astronomers announced the discovery of a planet orbiting the star 51 Pegasi, exoplanets—which orbit stars other than the sun—ha
