How Can Astronauts Tell How Fast They’re Going?

Astronauts can’t judge speed in space the way we do on Earth, because there are no familiar visual cues or air to measure against.

Instead, they use physics-based methods: displacement over time, along with a chosen reference frame, to calculate velocity.

This approach is critical for navigation on missions to the Moon and Mars, where GPS may be unavailable and landmarks are scarce.

Programs like Orion and Artemis IV depend on precise motion tracking to keep spacecraft on course and ensure mission success.