5. • Stars form groupings called galaxies. • There are about 80-100 billion galaxies in that part of the Universe we can observe. • There may be more in the Universe beyond what we are able to detect. • Each galaxy has billions or trillions of stars. • Many astronomers believe that stars in a galaxy orbit around a black hole.
15. A nebula called NGC 6302. What resembles butterfly wings are actually boiling cauldrons of gases heated to more than 36,000 degrees F.
17. • Sometimes part of the cloud shrinks and forms a ball as gravity pulls the gas and dust particles closer and closer together. • The gas and dust inside the ball bump into one another causing the temperature to rise.
19. • The heated gases expand balancing the inward pull of gravity. gravity hot gases expanding
20. • The energy moves through the outer layers of the ball and into space as electromagnetic radiation. • The visible light causes the ball to glow ••••••• and
45. Upper section of the picture is the bluish color of hot stars newly formed stars reflected by a cloud of cool gases and dust. The lower red section is Antares, a super red giant which is gradually shedding layers.
46. Antares – a Red Super Giant Anatares, a Red Super Giant in the Milky Way Galaxy in the process of dying.