I am the scientist who discovered that galaxies are moving away from us, proving the universe is expanding. Who am I?A. Isaac NewtonB. Edwin HubbleC. Galileo Galilei, When light from distant galaxies stretches and shifts toward the red end of the spectrum, I am the evidence of expansion. What am I?A. RedshiftB. BlueshiftC. Reflection, I am the theory that says the universe began from a hot, dense point and has been expanding ever since. What am I?A. Big Bang TheoryB. Steady State TheoryC. Evolution Theory, I am everything—space, time, matter, and energy. Scientists estimate my age to be about 13.8 billion years. What am I?, I am the mysterious force that causes the universe’s expansion to speed up, even though scientists don’t fully understand me. What am I?A. Dark MatterB. Dark EnergyC. Gravity, "I am a collection of billions of stars, dust, and gas bound together by gravity. You live inside me. " What am I?, "I am a natural satellite, I light up the night but I don’t shine on my own." What am I?.

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