Here are some interpretations and examples:
1. Orbited Earth:
* Many spacecraft have orbited Earth: Examples include the International Space Station (ISS), the Hubble Space Telescope, and various satellites for communication, weather monitoring, and research.
2. Landed on Earth:
* Spacecraft designed for landings: These include the Apollo lunar modules (which landed on the Moon, but brought astronauts back to Earth), the Soviet Luna landers (which landed on the Moon), and various probes that have landed on Mars, Venus, and other planets.
* Spacecraft that re-entered the atmosphere: This includes the Space Shuttle, Soyuz capsules, and other spacecraft that were designed to return astronauts or payloads to Earth.
3. Flew by Earth:
* Many spacecraft have used Earth's gravity for a "gravity assist" maneuver: This allows them to gain speed and change direction.
* Flyby missions: Some spacecraft have flown past Earth to study the planet or use it as a stepping stone to other destinations.
4. Objects from space that entered Earth's atmosphere:
* Meteors and meteoroids: These are small particles of rock or dust that burn up in the atmosphere.
* Asteroids and comets: Larger objects that can sometimes enter the atmosphere, sometimes leading to impact events.
It's important to be specific about what you mean by "visited" when asking this question. Do you mean spacecraft that are currently orbiting Earth? Spacecraft that have landed on Earth? Or something else?
