Which planet has the biggest sun in its sky?
The biggest sun in any known sky belongs to TOI-2431 b, where the star spans about 96.3 times the width of the Sun seen from Earth and fills a large part of the daytime sky. Everything about TOI-2431 b →
| # | World | Apparent sun size | Equilibrium temp |
|---|---|---|---|
| ★ 1 | TOI-2431 b | 96.3× our Sun | 1790°C (3254°F) |
| 2 | TOI-2260 b | 91.0× our Sun | 2336°C (4237°F) |
| 3 | TOI-2109 b | 89.3× our Sun | 3373°C (6103°F) |
| 4 | Kepler-1340 b | 88.0× our Sun | 1901°C (3454°F) |
| 5 | K2-141 b | 86.2× our Sun | 1830°C (3326°F) |
| 6 | KOI-1843.03 | 85.2× our Sun | 1381°C (2518°F) |
| 7 | K2-157 b | 84.7× our Sun | 2159°C (3918°F) |
| 8 | Kepler-990 c | 83.2× our Sun | 2113°C (3835°F) |
| 9 | Kepler-91 b | 82.0× our Sun | 1767°C (3212°F) |
| 10 | Kepler-78 b | 79.2× our Sun | 1950°C (3542°F) |
| 11 | K2-131 b | 77.6× our Sun | 1950°C (3542°F) |
| 12 | TOI-561 b | 75.9× our Sun | 2046°C (3715°F) |
| 13 | K2-223 b | 75.5× our Sun | 1998°C (3628°F) |
| 14 | TOI-1444 b | 75.3× our Sun | 1857°C (3374°F) |
| 15 | Kepler-1547 b | 72.9× our Sun | 2913°C (5275°F) |
| 16 | EPIC 220674823 b | 72.2× our Sun | 2051°C (3724°F) |
| 17 | Kepler-1323 b | 70.6× our Sun | 2018°C (3664°F) |
| 18 | HD 80653 b | 69.8× our Sun | 2165°C (3929°F) |
| 19 | WASP-103 b | 69.8× our Sun | 2235°C (4055°F) |
| 20 | TOI-1798.02 | 69.7× our Sun | 1663°C (3025°F) |
| 21 | WASP-12 b | 69.7× our Sun | 2328°C (4222°F) |
| 22 | KELT-9 b | 69.3× our Sun | 3648°C (6598°F) |
| 23 | Kepler-1368 b | 68.2× our Sun | 1812°C (3293°F) |
| 24 | WASP-78 b | 68.1× our Sun | 2197°C (3986°F) |
| 25 | WASP-47 e | 66.9× our Sun | 1719°C (3126°F) |
Showing the top 25 of 5,571 that qualify.
This is a geometry problem, not a brightness one: the angle a star covers in the sky follows from its radius and the planet's orbital distance, both of which are catalogued. From Earth the Sun spans about half a degree, roughly the width of a pencil eraser held at arm's length. Multiply that by the figures in this table and the star stops being a disc you can cover with a thumb and becomes a wall of light.
Every world near the top of this ranking orbits its star in hours or a couple of days, which is why the temperature column reads the way it does. These are not places with pleasant enormous sunsets: the same closeness that makes the star huge makes the surface molten.
Which planet has the biggest sun in its sky?
The biggest sun in any known sky belongs to TOI-2431 b, where the star spans about 96.3 times the width of the Sun seen from Earth and fills a large part of the daytime sky.
How big does the Sun look from Earth?
About half a degree across, which is close enough to the Moon's apparent size that a total eclipse works at all. Every figure in this table is a multiple of that half-degree disc.
How big would the sun look from the record holder?
About 96.3 times as wide as the Sun looks from Earth on TOI-2431 b, covering a substantial fraction of the sky rather than a small disc in it.
Where does the sun look biggest in our own solar system?
From Mercury, where the Sun spans roughly two to three times the width it does from Earth, depending on where Mercury is on its eccentric orbit. Every world on this table beats that many times over.
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