The Artemis II astronauts set up cameras to capture the stages of the eclipse, after earlier losing connection with Nasa for 40 minutes.

Galactic cosmic rays (GCRs) are mostly absorbed by Earth's atmosphere before they can reach the surface. However, they pose a significant radiation hazard to astronauts and high-altitude pilots, which is accepted as part of the job and taken into account when designing missions and the technology that supports them.

Earth has only one natural satellite, the moon, which is relatively large compared to its parent planet. It orbits Earth at an average distance of about 384,400 kilometers and completes one revolution approximately every ...

Astronomers recently detected a stray quasi-moon in our planet’s orbit, but it's hardly the first stowaway to hang out around Earth. Unlike the Earth's moon, quasi-moons are not gravitationally bound to our planet. Some may be asteroids, which orbit the ...

The Artemis II crew is more than halfway to their final destination of the moon.

High-energy particles called galactic cosmic rays (GCRs) bombard unprotected objects in space, often causing damage. Earth, however, is protected by its magnetic field, which creates a protective shell around the planet that can deflect dangerous charged particles,