For 10 points, name these objects, large bodies that revolve around stars other than the sun.
One method for detecting these objects features an amplification as a function of the normalized angular parameter u equal to u^2+2 over u times square root u^2+4. Another method to detect them employing a hydrogen fluoride tank to capture more precise spectra was developed by Campbell, Walker and Yang and uses variation in radial velocity. One hypothesis about a subset of these objects advanced by Ward and Brownlee rejects the principle of mediocrity by setting out conditions such as a circular orbit around the galactic center and a sufficiently large primary to prevent tidal locking. Gravitational microlensing is used to detect these objects, which are generally not terrestrial if they orbit population II stars, which prevents life from developing. For 10 points, name these objects, large bodies that revolve around stars other than the sun.
One method for detecting these objects features an amplification as a function of the normalized angular parameter u equal to u^2+2 over u times square root u^2+4.
{extrasolar planets} [or {exoplanets}; prompt on {planets}; prompt on anything about {looking} for {stars} that have {planets} that {can host} extraterrestrial {life}; accept {clear}-{knowledge} equivalents]