Extrasolar Planets – Part 2
We have been examining extrasolar planets – planets that orbit a star other than the sun. The first exoplanets were discovered by measuring the slight wobble their gravity induces on their star. Amazingly, and despite the challenges involved, around 50 exoplanets have now been directly observed using powerful telescopes. But the majority of exoplanets have been discovered using the transit method. This technique, along with the others, has allowed us to discover nearly 5000 extrasolar planets.