In which year was the Hubble Space Telescope deployed into Earth orbit?

The correct answer is 1990.

Step-by-Step Explanation:
1. Project Overview: The Hubble Space Telescope (HST) is a landmark space-based observatory built as a collaboration between NASA and the European Space Agency (ESA).
2. Launch & Mission: Hubble was carried into space aboard the Space Shuttle Discovery during mission STS-31, which launched from the Kennedy Space Center on April 24, 1990.
3. Orbital Deployment: The following day, on April 25, 1990, the telescope was deployed into low Earth orbit.
4. Conclusion: Therefore, the Hubble Space Telescope was deployed into Earth orbit in the year 1990.