Choose the best description of the transit method of locating exoplanets. A When a planet passes between a star and an observer the luminosity of the star is reduced by a small amount.
B Using satellite based telescopes in different locations astronomers are able use parallax calculations to determine if there are planets in orbit around a star.
C Using a telescope, wobble can be detected from the effect that the planet's gravity has on the star.
C By aiming powerful telescopes directly at star systems astronomers are able to detect larger planets.

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?