Artemis II Astronauts Complete Historic Lunar Flyby: Journey Around the Moon

Moon's Surface

The moon’s near side is visible to the right, marked by distinct dark patches, while the far side remains unseen from Earth.

NASA

In a historic event, humans have returned to the moon for the first time since Apollo 17 in 1972. On April 6, four astronauts from NASA’s Artemis II mission circled the far side of the moon, reaching unprecedented distances from Earth.

Mission Commander Reed Wiseman emphasized that this journey marks a significant beginning, surpassing Apollo 13’s record of 400,171 kilometers set in 1970. “Let’s inspire this generation and the next to ensure this distance record is challenged,” he stated during a NASA livestream. During the mission, the Artemis team proposed naming two newly discovered craters: “Integrity,” after the Orion capsule, and “Carol,” in honor of Wiseman’s late wife.

Throughout the flyby, the astronauts engaged in both window-side observations and cabin communications with mission control in Houston, Texas. The crew comprises NASA astronauts Wiseman, Christina Koch, and Victor Glover, alongside Canadian Space Agency astronaut Jeremy Hansen.

As Orion orbited behind the moon, the sun appeared smaller in the sky, culminating in a rare solar eclipse not observable from Earth. The astronauts donned eclipse glasses to view the sun and witness its corona, potentially allowing them to capture unprecedented lunar details free from atmospheric interference.

Artemis astronauts experienced an extraordinary solar eclipse.

NASA

The astronauts captured stunning details of the lunar surface, showcasing its vibrant color diversity. While the moon appears gray from Earth, close-up observations reveal hues of green, brown, and even orange, attributed to chemical changes in the lunar soil. “The rapid transformations of the Earth as we orbit the moon are breathtaking,” Hansen noted.

As they orbited the Moon, the crew observed previously unseen regions. They took special interest in the Terminator—the boundary separating day from night—where deep shadows accentuate the landscape’s features. “The visual magic of the Terminator, with its bright islands and dark valleys, is captivating,” Glover remarked.

The astronauts expressed deep emotions witnessing the moon’s diverse terrain up close, imagining what it would be like to traverse its surface. “The moon is a real entity in the universe, not merely a distant poster in the sky,” Koch stated.

NASA astronaut Reed Wiseman took this breathtaking photo of Earth from the Orion spacecraft.

NASA/Reed Wiseman

The Orion capsule reached its closest point to the lunar surface, approximately 6,545 kilometers away. This milestone will stand until the Artemis IV mission, which plans a landing in 2028.

As Orion returns to Earth, expected on April 10, the astronauts will splash down in the Pacific Ocean off California’s coast. Following their return, the team will analyze notes, photos, and scientific findings in preparation for advancing the Artemis program.

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Source: www.newscientist.com

Next week, the JUICE spacecraft might be visible during a close flyby of Earth.

JUICE spacecraft may be visible from Southeast Asia during unprecedented operation

European Space Agency

The Jupiter Icy Moons Explorer (JUICE) will land on Earth in what the European Space Agency (ESA) calls a “double world first.” It is scheduled to fly past Earth and the Moon on August 19 and 20, the first of several complex maneuvers along a looping path to Jupiter. You may be able to see the spacecraft in the sky as it speeds past.

JUICE was launched on April 14, 2023, and has been orbiting the Sun almost parallel to Earth ever since. But on August 19, its journey will start to get interesting: it will pass within 700 km of the Moon's surface, slowing down slightly using a method called gravity assist. The next day, it will drop to less than 7,000 km above Earth's surface, curving its orbit even further. That's when eagle-eyed astronomy fans in Southeast Asia may get a glimpse of the spacecraft.

All of this is necessary because if JUICE were to fly in a straight line to Jupiter, it would need more than 60,000 kilograms of fuel to get there, and even more to slow down and enter orbit once there. With the entire spacecraft's mass unfueled at 2,420 kilograms, this just isn't feasible. Instead, upcoming Earth-Moon flybys will send the spacecraft to Venus, where it will begin to accelerate, then fly past Earth twice to get it just fast enough to reach Jupiter in 2031.

The first maneuver may be the most complex of the entire mission, as JUICE must pass precise points relative to both the Earth and the Moon to en route to Venus. “It's like going through a very narrow corridor very fast, with the accelerator at full speed with only millimeters of clearance on the side of the road,” said ESA's Ignacio Tanco in statementA dual Earth-Moon flyby has never been attempted before, nor has a dual gravity assist been performed.

If all goes well, JUICE will not only head to Venus and then Jupiter, but it will also perform the first major tests of its scientific instruments. For some of the probes, this will be their only chance to observe the planet's surface and iron out any kinks before they reach orbit around Jupiter and begin their mission to search for hints of possible life on the planet's giant moons.

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Source: www.newscientist.com