Science quiz
Planets in order of escape velocity
Eight planets, from the hardest to leave to the easiest. Escape velocity depends on both mass and size, so it is not quite the order of either.
- Format
- Put them in order
- Items
- 8 to sort
- Limit
- None
- Level
- Hard
- Checked
- 2026.10.03
See every entry and put the whole list in order.
- Entries
- 8
- Sort by
- Escape velocity
- Time limit
- None
- Touch screens start in Tap mode: tap the entries in order, and tap one again to take it back.
- Drag mode: drag an entry (press and hold on a phone), or use the arrow buttons.
- Keyboard: space to pick up, arrows to move, space to drop.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
About this quiz
Escape velocity is the speed an object needs at the surface to coast free of a planet's gravity for good, ignoring the air. It grows with mass and shrinks with radius.
- Earth's escape velocity is about 11.2 km/s, or roughly 40,000 km/h.
- Neptune is smaller than Uranus but harder to escape, being heavier.
- Mercury, the smallest planet, is the easiest to leave.
Sources
- [1]NASA Jet Propulsion Laboratory. Planetary Physical Parameters.
Note on the data. Escape velocities are the figures in the table, shown to two decimal places. Radii, masses, densities, rotation and orbital periods, gravity and escape velocities are the figures in the JPL Solar System Dynamics tables of planetary physical parameters, read on 3 October 2026. The five dwarf planets are the five in that table, which are the five the International Astronomical Union recognises.
Last checked October 3, 2026
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