Think, Write, Pair, Share What do you already know about galaxies? Galaxies are made of stars Galaxies are large Galaxies are smaller than the universe When we look out into the night sky what may look like a single star could be an ____galaxy_________________________. Galaxies are huge rotating collections of _______gas__, dust_____________, billions of _____stars________, __planets___________ and other _________objects____________________. Our Galactic home is the _____________Milky Way_________ galaxy. The Milky Way contains more than ____________200 billion___________ stars, including our Sun. You can see the Milky Way galaxy without any telescopes! All you need is a clear night sky. The Milky Way appears like an arch of light in the night sky. The Milky way is very large – __________100 million light years __________________ across. Our Sun is _______________30 million light years___________ from the center of the galaxy, which is good because we want to stay far away from the ______________black hole _____________________ at the center of our galaxy. Black Holes Black holes are thought to be at the center of galaxies. These are extremely _______dense______ quantities of matter in space. They have such strong ______________gravity______________________ that nothing – not even _________light____ – is fast enough to escape. Black holes are made when a star that is ________30 times________ heavier than the Sun dies and leaves a core that is so massive that it ______collapses___________ under its own ____gravity____________. Galaxies also contain _______________star clusters___________. Star clusters are groups of stars that develop together from the same _______nebula________ (a star nursery – full of gas).