1. As the first 300 ,000 years pass, what happens to the temperature of the universe? Hint.: Read the text for each of the events up to 300,000. 2. Which subatomic particle is the first to show up in the universe? 3. When were the first recognizable elements thought to be created? 4. In the future, what would you expect to happen to the distances between galaxies?

1. As the first 300,000 years pass, the temperature of the universe decreases. After the Big Bang, the universe was extremely hot. As it expanded, it cooled down. By the time the first stars and galaxies began to form, the temperature had decreased significantly.<br />2. The first subatomic particle to show up in the universe was the proton. Protons, along with neutrons, were the first particles to form after the Big Bang.<br />3. The first recognizable elements are thought to have been created shortly after the Big Bang, around 10 minutes after the event. These elements were primarily hydrogen and helium.<br />4. In the future, it is expected that the distances between galaxies will continue to increase due to the ongoing expansion of the universe. This expansion is driven by the energy from the Big Bang and is causing galaxies to move away from each other.