An elliptical galaxy is a huge collection of stars, gas, and dark matter that has a smooth, oval or egg‑like shape with no visible spiral arms or clear internal structure.

Quick Scoop

Think of an elliptical galaxy as a glowing, 3D cosmic football or sphere made mostly of old stars, without the pretty spiral arms you see in pictures of the Milky Way.

  • It has a smooth, featureless appearance, like a fuzzy ball of light.
  • The shape ranges from almost round (E0) to very stretched (E7) in the Hubble system.
  • It contains very little gas and dust , so almost no new stars are forming.
  • It is dominated by old, red or yellow stars , sometimes called an “elderly” galaxy population.
  • Many of the largest galaxies in the universe are ellipticals, but there are also small dwarf ellipticals.

How it differs from spiral galaxies

  • Shape:
    • Elliptical: ball or stretched oval, no arms.
* Spiral: flat disk with clear spiral arms and a central bulge.
  • Stars and gas:
    • Elliptical: mostly old stars, little gas/dust, low star formation.
* Spiral: mix of young and old stars, lots of gas/dust, high star formation in the arms.
  • Star orbits:
    • Elliptical: stars move in randomly oriented orbits, forming a 3D swarm.
* Spiral: stars mainly orbit in a **thin disk** in similar directions.

How astronomers think they form

Astronomers often link elliptical galaxies to galaxy mergers and collisions , especially between spiral galaxies.

  • When galaxies collide, their gas and dust can be blown out or used up in intense bursts of star formation.
  • After the chaos settles, the leftover stars end up in a big, smooth, spheroidal swarm – what we see as an elliptical galaxy.

A simple way to picture it:

Take two neat, disk‑like spiral galaxies, smash them together over a few billion years, and you’re likely to end up with one big, smooth elliptical full of older stars.

Why they matter in modern astronomy

Elliptical galaxies are important because:

  • They trace the history of galaxy mergers and interactions in the universe.
  • Their old stars act like “fossils” that tell us what the universe was like long ago.
  • They host some of the most massive black holes and most massive galaxies we know of.

You’ll see them a lot in images of galaxy clusters , where ellipticals tend to sit near the center as giant, old cosmic cities of stars.

TL;DR:
An elliptical galaxy is a large, oval‑shaped galaxy made mostly of old stars, with very little gas, dust, or new star formation, often thought to be the end‑product of galaxy collisions.

Information gathered from public forums or data available on the internet and portrayed here.