A SpaceX Falcon 9 rocket blasted off from California on Friday and carried 50 more satellites into orbit for the Starlink internet constellation.

A SpaceX webcast showed the rocket's upper stage deploying the satellites a little over an hour after the 9:12 a.m. liftoff from Vandenberg Space Force Base.

The satellites will use their own thrusters to move into their operational orbits over a period of weeks.

The first stage successfully landed on a "droneship" in the Pacific Ocean. It was the fourth successful launch and landing of the reusable booster.

Starlink is a space-based system that SpaceX has been building for years to bring internet access to underserved areas of the world.

Hawthorne, California-based SpaceX has close to 2,000 Starlink satellites orbiting Earth at an altitude of 340 miles (550 kilometers).

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NASA mission managers updated Artemis I progress ahead of the March rollout of the massive Space Launch System rocket and Orion spacecraft to Kennedy Space Center's Launch Pad 39-B for what the agency calls a wet dress rehearsal.

While it's targeting March 16 at 6 p.m. for the 322-foot-tall rocket to make the 4.2-mile journey to the pad, the agency will need a month or more for testing and a rollback to the Vehicle Assembly Building before NASA signs off on a launch attempt. So an April launch window has been taken off the board.

"April is not a possibility. We're still evaluating the tail end of May," said Tom Whitmeyer, NASA's deputy associate administrator for exploration systems development. "But I want to be really careful once again, being straightforward with you. You know, we really need to get through this next few weeks here, see how we're doing."

The next possible windows for launch are from May 7-21, June 6-16 and June 29-July 12.

The majority of work inside the VAB is done ahead of the wet dress rollout, Whitmeyer said, including the last major hardware testing that involved the installation of the explosives on the vehicle that would be used in the event of an abort launch scenario.

Scientists say China's Yutu-2 rover, part of the Chang'E-4 mission, has found several small glass globules on the moon's far side. While tiny glass beads have been found previously in lunar samples brought back by the Apollo astronauts, the ones found by Yutu-2 are much bigger and translucent.

The discovery was made by Dr. Zhiyong Xiao, one of the lead scientific team members of the Chang'E-4 mission. They beads were found by looking at panoramic images taken by the rover. Since the rover doesn't have sampling capabilities and is not a sample return mission like it's older sibling, the Chang-E-5 mission, there is no compositional data on the glass beads, only observational evidence.