Oceanwater 100 200 300 1400 Depth (km) 500 1600 2700 Key • Earthquake focus What is the most likely cause of the earthquakes near this plate boundary? Fotofan

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.