I frequently wonder if we're alone in the universe. Researchers have estimated that 100 billion Jupiter-sized planets orbit the centre of our Milky Way galaxy rather than a particular star.
These 'rogue' planets are believed to be formed in planetary systems with two stars, where gravity disrupts the planets' orbits. Astronomers discover faraway planets through observation, but must infer how many have probably been cast out of their orbits.
I enjoy learning about the cosmos because it can tell us more about ourselves and makes me appreciate our home on Earth.