Stars & Constellations. Week 7. What is a star?. a ball of gas held together by its own gravity gravitational force continually tries to collapse the star by pulling gas molecules toward its center Gravity is counteracted by the pressure of the hot gas inside the center of the star
its own pattern of
Northern Circumpolar Constellations
Ganymede would become the cupbearer for the Olympian gods.
in many different ways, but each time his incredible physical strength allowed him to survive. The Romans called him Hercules. Hera cast a spell of madness on Heracles, causing him to commit a great crime. In order to be forgiven, he had to perform twelve difficult tasks. One of these tasks was destroying the terrible nine-headed water-serpent, Hydra.
During the battle between Heracles and Hydra, the goddess Hera sent a giant crab to aid the serpent. But Heracles, being so strong, killed the crab by smashing its shell with his foot. As a reward for its service, Hera placed the crab's image in the night sky.
that Typhoeus was attempting to tear Jupiter into pieces; he blew a shrill note on his pipes, and Typhoeus fled. Jupiter then placed the new shape of Bacchus in the heavens out of thanks for the rescue.
Perseus had to fetch the head of the Gorgon Medusa whose head could turn anyone who looked at it into stone. With the help of Hermes, Perseus succeeded. On his voyage back to Seriphos, he met the beautiful Andromeda in Ethiopia and married her. When his triumph became known, he was invited to the city of Larissa to participate in funeral games in honor of the king.
These six galaxy clusters are a subset of the 38 that scientists observed with Chandra, with distances ranging from 1.4 to 9.3 billion light years from Earth, to help determine the Hubble constant.