1. Assume all the atoms in the universe are hydrogen. (In actual practice, over 75% of the atoms in the universe are hydrogen.) 2. Assume the sun is a typical star (made of pure hydrogen) has a density of 1.4 g/cm3 and is a sphere with a radius of 7.0*108m 3. Assume that there are 100 billion stars in our Milky Way galaxy that are identical to our sun. 4. Assume that there are 10 billion galaxies in the universe identical to our Milky Way galaxy.

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Q: 5. A brown stinky liquid has density = 3.119g/mL. Calculate the volume of 98mL of this liquid.

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.