About GJ 900 b
GJ 900 b is an epic exoplanet. It lies about 67.9 light-years from Earth, has an equilibrium temperature near 1 K, spans roughly 12.4 Earth radii and weighs about 3,496.11 Earth masses.
A deep-frozen world far from its star's warmth.
Epic exoplanet 51 EP
GJ 900 b
RA 353.7526° · Dec 1.6055° · exoplanet
Score breakdown
· 5 badgesEpic 68 pts → Anomaly
- Denser than iron +18
- Directly imaged +16
- Frozen world +8
- Confirmed exoplanet +5
- Gas giant +4
Total score 51
17 more points to reach Anomaly.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Frozen world · +8
- Denser than iron · +18
- Directly imaged · +16
Trivia
What makes it special
- Frozen world. A deep-frozen world far from its star's warmth.
- Heavyweight. Packed denser than solid iron.
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 1.2 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 106 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 679 years in a starship at a tenth of light speed.
- Distance. 67.9 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1958.
Saying hello
- Say hello. A radio message and its reply would take 136 years round-trip.
By the numbers
- Size. About 12.4× the width of Earth.
- Volume. About 1907 Earths could fit inside it.
- Mass. Roughly 3496× Earth's mass — about 11 Jupiters.
- Your weight. You'd weigh about 22.7× your Earth weight standing here.
- Density. Denser than solid iron.
- Temperature. A frigid -272°C — colder than dry ice.
How we found it
- Discovery. Found by Multiple Observatories using the imaging method.
Properties
- density gcc
- 10.1
- discovery facility
- Multiple Observatories
- discovery method
- Imaging
- dist ly
- 67.8616
- eq temp k
- 1.48
- insolation
- 0
- mass earth
- 3496.1125
- name
- GJ 900 b
- radius earth
- 12.4
- sys num planets
- 1
How to see it
Like any astronomical target, GJ 900 b is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.
Why GJ 900 b is an epic exoplanet
GJ 900 b scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 17 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, Denser than iron and Directly imaged — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.