Rare exoplanet 44 EP

Kepler-425 b

RA 290.3580° · Dec 40.5677° · exoplanet

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Score breakdown

· 6 badges

44 pts · Rare

Rare 46 pts → Epic

Puffy low-density world +12
Hot Jupiter +10
Distant (>1000 ly) +10
Confirmed exoplanet +5
Gas giant +4
Found by Kepler +3

Total score 44

2 more points to reach Epic.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Hot Jupiter · +10
Puffy low-density world · +12
Found by Kepler · +3
Distant (>1000 ly) · +10

Trivia

What makes it special

Cotton-candy planet. So low-density it would float on water.

Could we get there?

Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

Aboard Voyager 1. ≈ 37.1 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 3.3 million years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 21.1 thousand years in a starship at a tenth of light speed.
Distance. 2109 light-years from Earth.

Look-back time

Look-back time. Its light left before the last ice age ended.

Saying hello

Say hello. A radio message and its reply would take 4218 years round-trip.

Standing on it

A year here. A full year lasts just 3.8 Earth days.

By the numbers

Size. About 11× the width of Earth.
Volume. About 1317 Earths could fit inside it.
Mass. Roughly 79.5× Earth's mass — about 0.2 Jupiters.
Your weight. You'd weigh about 0.7× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. Around 797°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by Kepler using the transit method.

Properties

density gcc: 0.27
discovery facility: Kepler
discovery method: Transit
dist ly: 2109.078
eccentricity: 0.33
eq temp k: 1070
insolation: 229.036
mass earth: 79.45
name: Kepler-425 b
orbital period days: 3.797
radius earth: 10.962
sys num planets: 1

About Kepler-425 b

Kepler-425 b is a rare exoplanet. It lies about 2,109.1 light-years from Earth, has an equilibrium temperature near 1,070 K, spans roughly 10.96 Earth radii and weighs about 79.45 Earth masses.

So low-density it would float on water.

How to see it

Like any astronomical target, Kepler-425 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 Kepler-425 b is a rare exoplanet

Kepler-425 b scores 44 points on Spacedle's rarity scale, which places it in the rare tier. Another 2 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Puffy low-density world, Found by Kepler and Distant (>1000 ly) — 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.