NASA’s fastest spacecraft moves 175 km per second — fast enough to circle Earth in 4 minutes.
How to Play: Guess if the spacecraft on the right reached a HIGHER or LOWER peak speed than the one on the left.
Name A
Name B
Top 10 Fastest Spacecraft
Spacecraft speeds reach extreme values via gravity assists or close solar approaches. Speeds are heliocentric (relative to the Sun) for interplanetary craft.
| # | Name | Peak Speed (km/h) | Unit |
|---|---|---|---|
| 1 | Parker Solar Probe (2024 perihelion) | 635,266 | km/h |
| 2 | Juno (Jupiter perijove 2016) | 265,000 | km/h |
| 3 | Helios 2 (1976) | 253,000 | km/h |
| 4 | Solar Orbiter (close pass) | 245,000 | km/h |
| 5 | Helios 1 (1976) | 235,000 | km/h |
| 6 | Galileo (Jupiter capture) | 173,000 | km/h |
| 7 | Cassini (Saturn capture 2004) | 108,000 | km/h |
| 8 | Voyager 1 (current) | 61,500 | km/h |
| 9 | BepiColombo (Mercury bound) | 60,000 | km/h |
| 10 | New Horizons (Pluto encounter 2015) | 58,000 | km/h |
Spacecraft Speed Records
Parker Solar Probe (NASA, launched 2018) holds the spacecraft speed record at 635,266 km/h during its closest perihelion in December 2024 — about 0.06% the speed of light.
Helios probes (1976) held the record for nearly 50 years before Parker. Both flew close to the Sun to measure solar wind.
Voyager 1 is the most distant human-made object (24 billion km) but not the fastest — its current speed is just 61,500 km/h heliocentric. It was faster on launch.
Frequently Asked Questions
Fastest spacecraft ever?
Parker Solar Probe at 635,266 km/h during its 2024 perihelion.
Why does Parker go so fast?
Gravity assist from the Sun. As Parker swings around the Sun, solar gravity accelerates it dramatically.
How fast is Voyager 1 now?
About 61,500 km/h relative to the Sun. It will take 38,000 years to reach the next nearest star.
Could spacecraft go light speed?
No — physics prohibits massive objects reaching c. The fastest theoretically achievable is ~0.1c (about 30,000,000 km/h) with current concepts.
Note: Spacecraft peak speeds in km/h per NASA mission reports.
More Wise Games to Try