Human history is told by the energy we use. At first we had to use our muscles, then we learned to control fire. We industrialized the world using coal and oil and entered the Atomic Age when we learned how
Are we the only living things in the entire universe? The observable universe is about 90 billion light years in diameter. There are at least one hundred billion galaxies, each with one hundred to one thousand billion stars. Recently, we’ve
Rogue planets are planets that travel through the universe alone. They inhabit the dark and vast space between the stars. Drifting alone through eternal darkness, no light warms their surfaces, and they’re exposed to the freezing cold of outer space.