# The greatest discoveries of the James Webb Space Telescope

Galaxies too bright for cosmic dawn, giant black holes far too early, the mysterious "little red dots", carbon dioxide in an exoplanet's atmosphere: what Webb has taught us since 2022. Which one fascinates you most?

- 46 votes · 13 items
- Feb 2, 2025 · J. Legrand
- https://even.best/en/l/3801/the-greatest-discoveries-of-the-james-webb-space-telescope

## Top 13

1. **Early supermassive black holes** (4 · ▲4 ▼0) — Billions of solar masses just 800 million years after the Big Bang.
2. **The Hubble tension confirmed** (4 · ▲4 ▼0) — Webb confirms a Hubble constant of about 73 km/s/Mpc.
3. **The "little red dots"** (3 · ▲4 ▼1) — Mysterious compact red objects in the young Universe.
4. **Bright galaxies at cosmic dawn** (3 · ▲3 ▼0) — Massive, luminous galaxies less than 500 million years after the Big Bang.
5. **JADES-GS-z14-0** (3 · ▲3 ▼0) — One of the most distant galaxies ever observed.
6. **Dust in the young Universe** (3 · ▲3 ▼0) — Carbon-rich dust in a galaxy barely a billion years old.
7. **Cassiopeia A** (3 · ▲3 ▼0) — A supernova remnant that explains where cosmic dust comes from.
8. **The JuMBOs of Orion** (2 · ▲3 ▼1) — At least 40 free-floating pairs of Jupiter-sized objects.
9. **The CO2 of WASP-39 b** (2 · ▲3 ▼1) — The first carbon dioxide clearly detected on an exoplanet.
10. **The rings of the Ring Nebula** (2 · ▲3 ▼1) — Ten concentric arcs beyond the main ring.
11. **Protoplanetary discs** (2 · ▲3 ▼1) — Three dust belts around Fomalhaut and water vapour around PDS 70.
12. **The Pillars of Creation** (2 · ▲2 ▼0) — Thousands of hidden stars in the Eagle Nebula.
13. **The atmosphere of K2-18 b** (1 · ▲2 ▼1) — Methane and carbon dioxide on a temperate exoplanet.

How is this ranking ordered? By people's votes: each ▲ adds a point and each ▼ takes one away. Anyone can vote and add what is missing.