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As of now, Earth is the only known planet where humans can live naturally. However, scientists are searching for habitable exoplanets within our galaxy where conditions for life as we know it might exist. Proxima Centauri b, TRAPPIST-1 system, and Kepler-186f are some of the exoplanets that have been identified as potential candidates for habitability.
They are in all three. Planets are in solar systems. There are lots of solar systems in a galaxy. There are lots of galaxies in the universe. So any planet is in a solar system, a galaxy and the universe.
Yes, all stars have solar systems. A solar system is a star and all the objects that orbit it, including planets, moons, asteroids, and comets. Our own solar system, with the Sun at its center, is just one example of a solar system among billions in the universe.
There are eight planets in our solar system that have moons: Mercury and Venus do not have moons, but all the other planets do.
There are four rocky planets in our solar system: Mercury, Venus, Earth, and Mars. These planets are primarily composed of solid material, such as rock and metal.
Yes, other galaxies have solar systems similar to our own Milky Way galaxy. These systems consist of stars like our Sun, planets, and other celestial bodies. Studying these systems helps scientists understand the diversity of planetary systems in the universe.