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A spiral galaxy filled with stars.

Stars & Galaxies

From the birth of stars to the grand design of galaxies — discover the objects that light up our Universe.

OverviewStar Life CycleStar TypesGalaxy TypesMilky WayDeep Dives

The Life Cycle of a Star

  1. Stellar Nebula

    1. Stellar Nebula

    Clouds of gas and dust collapse.

  2. Protostar

    2. Protostar

    Gravity pulls material into a young star.

  3. Main Sequence

    3. Main Sequence

    Hydrogen fusion powers the star.

  4. Red Giant

    4. Red Giant

    The star expands and cools.

  5. Planetary Nebula

    5. Planetary Nebula

    Outer layers drift away from the core.

  6. White Dwarf

    6. White Dwarf

    The core remnant cools over time.

Types of Stars

O-type star
O
B-type star
B
A-type star
A
F-type star
F
G-type star
G
K-type star
K
M-type star
M
HotterCooler

Stars come in a variety of sizes, temperatures, and colors.

The Milky Way galaxy stretched across a starry sky.

Featured: The Milky Way

Our home galaxy is a barred spiral with more than 100 billion stars, planetary systems, dust lanes and dark matter.

Explore the Milky Way

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