What are Galaxies?

What are Galaxies? Read each slide to learn about galaxies. Click on the arrows or slide to move to the next slide. Galaxies are large collections of stars, gas and dust held together by gravity. What type of galaxy do we live in? elliptical irregular spiral True or False.There are other solar systems in our galaxy. True False True or False.Scientists know that there are only 100 billion galaxies in the universe. True False What galaxy is our solar sytem in? Click on each of the 3 slides to summarize the different types of galaxies. Sort the information into the correct galaxy. Spiral flat disk bulging center spiral arms stars, planets, dust and gas Elliptical bright centers mostly old stars very little dust and gas planets roundish or elliptical shape Irregular no regular shape stars, planets, dust, and gas The Universe Now let's put the Earth, Moon, Sun, Planets, and Solar System all together. Answer the questions after the video.Remeber, you can rewatch the video and used the red slide to find answers if you can't remember. How many moons are in our solar system? 178 145 105 95 Which of the following defines the universe? the whole solar system a group of planets the galaxy that includes the sun all things that exist in space Which list goes from smallest to largest? galaxy, universe, solar system solar system, galaxy, universe solar system, universe, galaxy universe, galaxy, solar system Which of these is an imporatant characteristic of a planet? it must be at least 92 million miles from the sun it must have at least 165 moons it must be massive enough to clear objects from its orbit it must have gravity What is a light year? a year in which the Sun gives off extra light the distance light travels in one year the distance of the Earth from the Sun the amount of time it takes all of the planets to orbit the Sun