* Defining "space probe" is tricky: The term can encompass a wide range of spacecraft, from small satellites to large, complex planetary explorers.
* No central registry: There's no official, comprehensive list of all space probes. Different organizations track different types of spacecraft.
* Spacecraft lifespan: Probes have varying missions and lifespans. Some may be decommissioned or become defunct, while others continue their journeys.
However, we can estimate:
* Thousands of spacecraft: There are likely thousands of spacecraft in orbit around Earth or on missions beyond it.
* Hundreds of "planetary probes": If we focus on probes designed to explore other planets, moons, asteroids, etc., the number would be much smaller, perhaps in the hundreds.
To get a more specific idea, you could:
* Check websites like:
* NASA's Spacecraft Database: https://nssdc.gsfc.nasa.gov/nmc/spacecraft/
* The Planetary Society's Mission Database: https://www.planetary.org/explore/space-missions/
* Search for specific mission lists from space agencies like:
* ESA (European Space Agency): https://www.esa.int/
* JAXA (Japan Aerospace Exploration Agency): https://www.jaxa.jp/
* Roscosmos (Russian Space Agency): https://www.roscosmos.ru/
Remember, the number is constantly changing, so any count you find will be a snapshot in time.
