Rare exoplanet 43 EP

GJ 3378 b

RA 90.2951° · Dec 59.5932° · exoplanet

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Score breakdown

· 3 badges

43 pts · Rare

Rare 46 pts → Epic

In the habitable zone +30
Super-Earth +8
Confirmed exoplanet +5

Total score 43

3 more points to reach Epic.

Badges

Confirmed exoplanet · +5
In the habitable zone · +30
Super-Earth · +8

Trivia

What makes it special

Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist.

Could we get there?

Verdict. Hopelessly far for any craft humanity can build today.

Getting there

Aboard Voyager 1. ≈ 442.6 thousand years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 39.3 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 252 years in a starship at a tenth of light speed.
Distance. 25.2 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 2001.

Saying hello

Say hello. A radio message and its reply would take 50.4 years round-trip.

Standing on it

A year here. A full year lasts just 21.4 Earth days.

By the numbers

Size. About 1.3× the width of Earth.
Mass. About 2.3× the mass of Earth.
Your weight. You'd weigh about 1.3× your Earth weight standing here.
Temperature. A surprisingly temperate -1°C average.

How we found it

Discovery. Found by Mauna Kea Observatory using the radial velocity method.

Properties

density gcc: 5.5
discovery facility: Mauna Kea Observatory
discovery method: Radial Velocity
dist ly: 25.1882
eccentricity: 0
eq temp k: 272
habitable zone: yes
insolation: 0.91
mass earth: 2.3
name: GJ 3378 b
orbital period days: 21.45
radius earth: 1.32
sys num planets: 1

About GJ 3378 b

GJ 3378 b is a rare exoplanet. It lies about 25.2 light-years from Earth, has an equilibrium temperature near 272 K, spans roughly 1.32 Earth radii and weighs about 2.3 Earth masses.

Sits where it's neither too hot nor too cold — liquid water could exist.

How to see it

Like any astronomical target, GJ 3378 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 3378 b is a rare exoplanet

GJ 3378 b scores 43 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, In the habitable zone and Super-Earth — 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.