Exploring the Universe: Stars, Galaxies, and the Solar System
Classified in Physics
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How Did the Universe Start?
The universe is everything that exists. Scientists estimate it could contain 100 billion galaxies. A galaxy is a large group of many stars and celestial bodies.
What Are Stars?
Stars are giant spheres of very hot gas. The Sun is the closest star to Earth.
Constellations
Constellations are visible at different times of the night. We see different constellations in the Northern Hemisphere and the Southern Hemisphere.
Types of Galaxies
Spiral galaxies are disc-shaped, with arms.
Elliptical galaxies are oval-shaped.
Irregular galaxies have no defined shape.
Solar System
Mercury, Venus, Earth, and Mars are inner planets. They are mostly made of rock.
Jupiter, Saturn, Uranus, Neptune, and Pluto are the outer planets. They are mostly... Continue reading "Exploring the Universe: Stars, Galaxies, and the Solar System" »