Halley's Comet (Nucleus)
15 km (49,213 ft)
Longest dimension
The icy core of the famous comet, measured along its longest side. About 15 km by 8 km.
Published
How big is that?
15 km is 1.7 times Mount Everest and 0.43% of the Moon.
Halley's Comet is the 14th smallest of the 39 Cosmic Scale objects, and the 26th largest of the 109 objects across all three SizeItUp games.
Size comparison
To scale, smallest to largest: Halley's Comet in orange beside the Cosmic Scale objects nearest in size, in teal.
| Object | Size | vs Halley's Comet |
|---|---|---|
| Mount Kilimanjaro (Earth)Africa's highest mountain, measured above sea level. | 5,895 m tall | 39% of the size |
| Mount EverestEarth's highest mountain, measured above sea level. | 8,848.86 m tall | 59% of the size |
| Halley's Comet (Nucleus) | 15 km long | – |
| Olympus Mons (Mars)The tallest volcano in the Solar System. Its real slopes are far gentler; only the height counts here. | 21.2 km tall | 1.4× bigger |
| Phobos (Moon of Mars)A lumpy little moon. Measured along its longest side. | 26 km long | 1.7× bigger |
In other units
| Metres | 15,000 |
|---|---|
| Kilometres | 15 |
| Feet | 49,210 |
| Yards | 16,400 |
| Miles | 9.321 |
How it's measured
Longest dimension. NASA.
Sources
- science.nasa.gov: Halley's dimensions are about 9.3 by 5 miles (15 kilometers by 8 kilometers).
Checked against the source on .
Could you have guessed it by eye?
Halley's Comet is one of the objects in Cosmic Scale, a daily size comparison game: you stretch a shape to the size you think is right beside one you know.