Journey Through the Cosmos

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Stars

Massive spheres of plasma held together by gravity
Produce energy through nuclear fusion
Create heavy elements essential for life
Control galaxy evolution
The Sun is a yellow dwarf star

Black Holes

Extreme gravity traps even light
Form from massive star collapse
Accretion disks emit radiation
Distort spacetime
Reside at galaxy centers

Nebulae

Birthplaces of stars
Composed of gas and dust
Glow under stellar radiation
Span hundreds of light-years
Orion Nebula is visible to naked eye

Galaxies

Contain billions of stars
Rotate for billions of years
Come in spiral & elliptical forms
Milky Way has 200+ billion stars
Build cosmic structure

Superclusters

Largest structures in the universe
Contain thousands of galaxies
Span millions of light-years
Reveal cosmic web
Laniakea holds the Milky Way