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Welcome to astronomy! Let's explore how stars form in giant nebulae and group together into huge galaxies.
Astronomy is the study of everything in outer space. Space contains glowing stars, giant clouds of dust called nebulae, and billions of galaxies.
A nebula is a giant cloud of gas and dust in space. Gravity pulls this gas together over time to form brand new stars.
A star is a massive ball of burning hot gas held together by gravity. Our Sun is a medium-sized star at the center of our solar system.
A galaxy is a cosmic system containing billions of stars, gas, and solar systems. Our solar system is located inside the Milky Way galaxy.
Compare a star, a nebula, and a galaxy, then arrange them in order from smallest to largest in physical size.
- Identify the size of a single star, which is one individual object like our Sun.
- Analyze a nebula, which is a massive cloud of gas large enough to create thousands of stars.
- Evaluate a galaxy, which holds billions of stars and nebulae together in one giant system.
- Order the space structures from smallest to largest: Star -> Nebula -> Galaxy.
