Test yourself on Astronomy with AI-generated multiple-choice questions, answers, and explanations.
Nuclear fusion powers the Sun and other stars by fusing hydrogen nuclei into helium, releasing vast amounts of energy that sustain the star's brightness and heat; this process began in the Sun's core about 4.6 billion years ago.
Many constellations are rooted in ancient mythologies; for example, the Orion constellation has been recognized since at least 2,500 BCE across various cultures, including the Egyptians and Greeks.