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Space & Astronomy

Artemis 1: the first step towards humanity's return to the Moon

January 13, 2022 | Comment icon 14 comments

The Orion spacecraft with its solar panels fully deployed. Image Credit: ESA
Later this year, NASA's Artemis 1 mission will take us one small step towards a return to the lunar surface.
On December 19 1972, astronauts Eugene Cernan, Harrison Schmitt and Ronald Evans splashed down safely in the Pacific Ocean, ending the Apollo 17 lunar mission. They were the last people to travel beyond low-Earth orbit - typically defined as less than 1,000km above the Earth's surface.

Some 49 years later, we are approaching the launch of Nasa's Artemis 1 lunar mission. Artemis is the latest in a long series of projects over many decades to attempt a human return to the Moon. It's by far the closest one to being realised, with the earliest launch attempts currently scheduled for March 2022.

Artemis 1 will not carry astronauts, but it will launch the first spacecraft capable of doing so on a return journey to lunar orbit in nearly 50 years. With the ultimate aim to establish a long-term human presence on and around the Moon, Artemis is the first in a series of increasingly complex deep space crewed missions slated for the coming years.

Artemis 1 consists of an Orion spacecraft which will be launched by the new space launch system - currently the world's most powerful operational rocket. Orion comprises the crew module, a conical capsule which can accommodate up to six astronauts for 21 days in deep space, and the European Service Module, containing Orion's main rocket engine.

The European Service Module generates electrical power with distinctive "x-wing" solar panels, and carries stores of water, breathable air and fuel. It also controls the thermal environment inside the crew module, keeping astronauts and electrical systems within safe temperature limits.

Two critical challenges

The two most difficult parts of any mission to space are launch and landing. Let's look first at how Artemis 1 will launch.

The space launch system consists of an enormous liquid-fuelled core stage, powered by engines from the Space Shuttle era, and two powerful side-mounted solid-fuelled booster rockets, which together produce nearly nine million pounds of thrust at launch.

Atop the core stage is the interim cryogenic propulsion stage, a smaller liquid-fuelled engine which will push Orion out of Earth orbit and towards the Moon.

The Orion spacecraft is now attached to the space launch system at the Kennedy Space Centre in Florida for a series of pre-launch tests and rehearsals. This includes fuelling the space launch system, and practising rolling all the elements of the rocket out to the launch pad.

Although the space launch system has never been flown before, the Orion spacecraft has been tested in space once. This was also without astronauts, back in 2014. While this test flight travelled beyond low-Earth orbit successfully, it didn't go all the way to the Moon.

Objects returning to Earth from the Moon are travelling considerably faster when they encounter our atmosphere than objects falling from low-Earth orbit. This generates very hot temperatures. So one key objective for Artemis 1 is to ensure that the thermal protection on Orion can withstand this ferocious heat of reentry into the Earth's atmosphere.
On returning home, Orion will be travelling at 25,000 mph when it reaches the top of Earth's atmosphere, and must withstand temperatures of 2,760C. For comparison, a spacecraft returning to Earth from the International Space Station in low-Earth orbit is typically travelling at speeds of 17,000 mph and encounters temperatures of roughly 1,900C.

What happens after takeoff?

Artemis 1 will launch from the Kennedy Space Centre into Earth orbit, whereupon the core stage of the space launch system will detach, and the interim cryogenic propulsion stage will ignite, sending Orion on its way to the Moon.

After a voyage lasting several days, Artemis 1 will swoop down to just 100km above the lunar surface, fire its onboard engines and enter a distant retrograde orbit around the Moon, which will carry it out to a maximum distance from Earth of some 430,000km. From such a distance the Earth would appear to an astronaut to be about the same size as the nail of your little finger held at arms length.

This will be the greatest distance from Earth ever reached by a human-capable spacecraft. The current record holder is the 1970 Apollo 13 mission, which was forced to abort a Moon landing after an explosion in one of the spacecraft's oxygen tanks.

During this period, engineers will test Orion's systems - such as its ability to retain air pressure and radiation levels inside the crew capsule. While Artemis 1 is primarily about ascertaining Orion's viability for future crewed missions, cameras at the ends of the European Service Module solar panels should provide breathtaking images of Orion in space, with the Earth and Moon as a backdrop.

After six days in lunar orbit, Orion will perform several more engine firings and another close lunar flyby, before beginning its voyage home. Exact timings of the flight will depend on when Artemis 1 is launched.

Numerous considerations for launch windows have to be made, such as ensuring that the Earth doesn't block sunlight from reaching the European Service Module's solar panels during the flights to and from the Moon, and that reentry and splashdown occurs in daylight to aid in recovery of the spacecraft.

It's anticipated that some 26 days after launch, Orion will detach the European Service Module and then point the flat base of the conical crew compartment, clad in thermal protection, towards Earth for what will hopefully be a safe atmospheric reentry and parachute-assisted splashdown in the Pacific.

Much rides on the success of this mission. All being well, we can hope to see Artemis 2 - with astronauts - take off in the coming years.

Gareth Dorrian, Post Doctoral Research Fellow in Space Science, University of Birmingham and Ian Whittaker, Senior Lecturer in Physics, Nottingham Trent University

This article is republished from The Conversation under a Creative Commons license.

Read the original article. The Conversation

Source: The Conversation | Comments (14)

Recent comments on this story
Comment icon #5 Posted by Still Waters 3 months ago
I was just about to post this. https://phys.org/news/2022-02-uncrewed-artemis-mission-moon.html
Comment icon #6 Posted by AnthonyS 3 months ago
Comment icon #7 Posted by Still Waters 3 months ago
Latest: NASA rules out April for Artemis I launch, could target May 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 boa... [More]
Comment icon #8 Posted by Still Waters 2 months ago
Your name can fly around the moon on NASA's Artemis 1 mission You can send your name on a trip around the moon with just a few clicks of your keyboard. NASA is inviting people to put their names on a flash drive that will launch on the agency's Artemis 1 mission, which will send an uncrewed Orion capsule around the moon and back a few months from now. https://www.space.com/fly-name-around-moon-nasa-artemis-1-mission Coming aboard in this manner is easy and free; just click the "get boarding pass" button at this NASA page. https://www.nasa.gov/send-your-name-with-artemis/
Comment icon #9 Posted by Still Waters 2 months ago
NASA’s Gigantic Crawler on the Move As Rollout of Mega Moon Rocket Inches Closer Yesterday, engineers and technicians at NASA’s Kennedy Space Center in Florida drove Crawler Transporter-2, which will carry NASA’s Moon rocket to the launch pad, to the doors of the Vehicle Assembly Building (VAB). Soon, the 6.6-million-pound crawler will go inside the VAB and slide under the Space Launch System rocket and Orion spacecraft placed on the Mobile Launcher. Technicians will finish up preparations to transport the rocket traveling at a top speed of 1 mph to Launch Complex 39B for a wet dress rehearsal... [More]
Comment icon #10 Posted by Desertrat56 2 months ago
NASA Atemis 1 moon megarocket rools out to the lalunch pad today https://www.space.com/artemis-1-moon-megarocket-rollout-webcast?utm_source=notification CAPE CANAVERAL, Florida — The first mission in NASA's Artemis moon program is set to roll out to the launch pad today (March 17).  More than 50 years after NASA landed the first humans on the moon with Apollo 11, the agency is gearing up to launch its next human lunar missions as part of the Artemis program. And the program's first mission, Artemis 1, will take a big step toward launch today, when the mission's rocket and spacecraft will roll ... [More]
Comment icon #11 Posted by Waspie_Dwarf 2 months ago
Nope, Starship will take many test flights until it is operational, SLS/Orion will, if all goes well, be operational after it's first test flight. NASA and SpaceX work very differently. SpaceX launches expecting failure. It then fixes whatever failed and launches again. It may take many launches before success. NASA, on the otherhand, test and test multiple times to ensure that their vehicles should work first time. Starship and Artemis I may both be sitting on the pad awaiting there first launches later this year but NASA expects their mission to succeed, SpaceX expects theirs to fail. There ... [More]
Comment icon #12 Posted by Hammerclaw 2 months ago
It doesn't have one, yet. Besides, if it's going to fly all the way to the moon and land, it's doesn't even need Artemis. NASA's way is obsolete--even Russia has a better system. Boeing is doing it NASA's way and neither has put a man in orbit. Space can't be subject to the whim of politicians, anymore, nor can craft be built, efficiently and economically, by egalitarian government committee. SpaceX is an investment in the future, whereas NASA is a taxpayer funded charity that squanders billions.
Comment icon #13 Posted by Jon the frog 1 month ago
https://www.cnn.com/2022/04/04/world/nasa-artemis-rehearsal-second-attempt-scrubbed-scn/index.html Again scrubbed... fudge.
Comment icon #14 Posted by Still Waters 1 month ago
Fuel leak thwarts NASA's dress rehearsal for moon rocket NASA's latest attempt to fuel its huge moon rocket for a countdown test was thwarted Thursday by a hazardous hydrogen leak, the latest in a series of vexing equipment trouble. The launch team had just begun loading fuel into the core stage of the rocket when the leak cropped up. This was NASA's third shot at a dress rehearsal, a required step ahead of a test flight to the moon. https://phys.org/news/2022-04-fuel-leak-thwarts-nasa-rehearsal.html

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