Time Scale of the Cosmos Astronomy Scale and History of the Universe Time Scale of the Cosmos Questions How long do humans live in reference to the time scale of the universe? How does parsec differ from a second? According to modern cosmology, what is the approximate age of the universe? How can scientists estimate the age of the universe when time itself is not absolute according to Einstein's Theory of Relativity? What formula is used to calculate the age of the universe? How old is the oldest known galaxy? During which step in cosmic evolution were the chemical bases for life created? How long have humans lived in the time scale of the universe? How is it possible that the observable universe is 46 billion light years yet the age of the universe is 13.7 billion years? What is the Drake Equation? How long is an eon in years? What is a longer period of time than an eon? What is longer: eons or light years? All the diagrams showing how massive bodies warp the space/time continuum (causing what we consider gravity) show the continuum as a 2-dimensional graph. Why is it planar and not 3-dimensional? How many years after the Big Bang did the planets form? How often do new stars form? How long does it take light to reach us from stars on the edge of the universe? How long would it take light to travel from the center of the universe to the furthest galaxy? Why did the first stars to form not have solar systems with Earth-like planets and satellites? What is the repeating universe theory? Why does gravity affect time? What evidence is there to show that the universe is changing? If Sirius exploded into a supernova how long would it be before we on Earth knew that it had happened? How long does it take heat to get to earth from the sun? How many light minutes is the Earth away from Mercury? How long does it take light from other stars to reach Earth? When did the first stars and galaxies form? When were the first planets formed? How many new galaxies are formed in the universe each year? How does this relate to the number that die? One light year is equivalent to how long in time? How long does it take to travel 500 light years? How long will it take for our solar system to be drawn into the center of the galaxy? How does time change as you approach a black hole? Does time stop as you approach a black hole? What date was the earth created? How old is our Universe? How would it take to get to the sun from earth? How long does it take light to get to earth from the sun? How long does it take the sun's rays to reach the earth? How long does it take the sun's energy to get to earth? Hypothetically, how long would it take to get to the sun by car traveling 70 mph? How long would it take light from the sun to reach pluto? How long would it take light from the sun to reach Neptune? How long would it take light from the sun to reach Uranus? How long would it take light from the sun to reach Saturn? How long would it take light from the sun to reach Jupiter? How long would it take light from the sun to reach Mars? How long would it take light from the sun to reach Earth? How long would it take light from the sun to reach Venus? How long would it take light from the sun to reach Mercury? How long would it take light from the sun to reach Ceres? How long would it take light from the sun to reach Eris? How long does it take light from the sun to reach Earth's surface? How long does it take for the Earth to go around the Sun once? How long does it take for light to get to Earth from the Moon? How long does it take to travel to the nearest star at the speed of light? If a star dies once it stars producing iron, how much iron would have to be manually inserted to destroy a star? And would it be possible to send iron into a star, or would it melt and not work? How long will it take to get to the moon by light speed? How far is the furthest planet in our solar system? How long does it take to get to Venus from Earth? On the cosmic calendar, about when did Earth form? How old is the light we see on earth? What do we mean by the lookback time to a distant galaxy? How many years does light year mean? How do scientists determine the age of galaxies? How do us humans know that there are millions of other galaxies? If galaxies are millions of years apart, how do scientists know that there are billions of other galaxies and that andromeda is the closest? Scale and History of the Universe View all chapters Scale of Earth, Sun, Galaxy, and Universe Time Scale of the Cosmos Light and Fundamental Forces The Big Bang Expansion of the Universe Prev Next