On this day in 1972, the Apollo 17 crew on their way to the Moon took a photograph of the Earth that became known as “The Blue Marble” (shown above). You can see Africa, the Middle East, and Antarctica. It remains one of the most popular images of the Earth.
The Orion spacecraft caught its own image of the Earth earlier in Artemis I mission (shown below). It is more of a black and white marble. We can expect to see many more images of the Earth in the years to come as the Artemis missions continue.
Image (Credit): View of the Earth from the Orion spacecraft on November 17, 2022. (NASA)
In a study published in Nature Astronomy, scientists from the University of Arizona challenge current views of Martian geodynamic evolution with a report on the discovery of an active mantle plume pushing the surface upward and causing earthquakes and volcanic eruptions. The finding suggests that the planet’s deceptively quiet surface may hide a more tumultuous interior than previously thought…Mantle plumes are large blobs of warm and buoyant rock that rise from deep inside a planet and push through its intermediate layer – the mantle – to reach the base of its crust, causing earthquakes, faulting and volcanic eruptions. The island chain of Hawaii, for example, formed as the Pacific plate slowly drifted over a mantle plume.
After 30 years of planning and negotiations, construction begins this week on the Square Kilometre Array (SKA), the world’s largest radio-astronomy observatory. The giant instrument — to be built across sprawling sites in Australia and Africa — will collect the radio signals emitted by celestial objects and will hopefully shed light on some of the most enigmatic problems in astronomy, such as the nature of dark matter and how galaxies form.
Saudi Arabia is in talks with other nations over plans for the next generation of space stations, which could one day serve as floating hotels among the stars. Mohammed bin Saud Al Tamimi, governor of the Communications, Space and Technology Commission, said he sees space commodities as a “huge opportunity”. He was speaking remotely on the first day of the Abu Dhabi Space Debate, a major conference that addressed the new geopolitics of space and emerging trends. Mr Al Tamimi said that the Kingdom would be announcing its national space strategy early next year.
Image (Credit): Big Bang expansion. (NASA/WMAP Science Team]
About 10,000 amateur scientists in 85 countries have already assisted with galaxy-mapping, but more help is needed in locating these distant galaxies billions of light-years away.
It is all part of the Dark Energy Explorers project using data from the Hobby-Eberly Telescope, a 10 meter telescope located at the McDonald Observatory in West Texas. Volunteers will assist with the Hobby-Eberly Dark Energy Experiment (HETDEX), which is designed to:
….find over one million galaxies that are 9 billion to 11 billion light-years away, yielding the largest map of the universe ever produced. The map will allow HETDEX astronomers to measure how fast the universe was expanding at different times in its history. Changes in the expansion rate will reveal the role of dark energy at different epochs. Various explanations for dark energy predict different changes in the expansion rate, so by providing exact measurements of the expansion, the HETDEX map will eliminate some of the competing ideas.
The Explorers website can walk you through all of the necessary details to help identify signals from distant galaxies. Approximately 247,000 galaxies have already been identified, but that is just a fraction of what scientist believe is out there in the patch of sky being observed.
Ultimately, the plan is to build a 3D map of the cosmos concentrated on galaxies in the early universe. This should assist scientists with their understanding of dark energy.
This is your chance to be an astronomer. Time to have fun and pitch in.
If you are looking for a fun gift that will encourage kids to learn more about the universe around them, then you cannot go wrong with a nightlight that illustrates the beauty of the nighttime objects above us. For instance, the Moon lamp shown above (there are many others like it on Amazon and elsewhere) allows an up-close view of this amazing orb. As with the Earth globes of old, seeing a world in three-dimensions and being able to touch it assists with understanding. Besides, in the case of the Moon, a youngster looking out the bedroom window will only see one side of the Moon, whereas the lamp provides the entire surface.
You can find similar lamps and nightlights showing Mars, Jupiter, and even the Milky Way (see below).
Or why not simply project the constellations onto the bedroom ceiling so kids can learn about the night sky even when it is cloudy outside? There is nothing like a personal planetarium.
Mind you, these gifts are not only for children, but it’s a good place to start. I may yet get one of those Moon lamps for my desk. Why should the kids have all the fun?
Image (Credit): A trasch bag lying beneath the Apollo Lunar Module in 1969. (NASA)
Back in July 2019, Vox had a great article about the waste astronauts left behind on the Moon. In the article, “Apollo Astronauts Left Their Poop on the Moon. We Gotta Go Back for That Shit.,” we learn about approximately 96 bags of human waste left behind on the moon. The topic is relevant today because (1) we are talking about returning to the Moon under the Artemis mission and (2) we probably want to learn more about the lifespan of this waste before we continue to deposit it on the Moon, Mars, and elsewhere. So maybe it is time to revisit the poop.
Earlier, The Atlantic had another article that listed much more human debris on the Moon than just the 96 bags (of urine, feces, and vomit, mind you). Here is the incomplete list:
more than 70 spacecraft, including rovers, modules, and crashed orbiters;
5 American flags;
2 golf balls;
12 pairs of boots;
TV cameras;
film magazines;
96 bags of urine, feces, and vomit;
numerous Hasselbad cameras and accessories;
several improvised javelins;
various hammers, tongs, rakes, and shovels;
backpacks;
insulating blankets;
utility towels;
used wet wipes;
personal hygiene kits;
empty packages of space food;
a photograph of Apollo 16 astronaut Charles Duke’s family;
a feather from Baggin, the Air Force Academy’s mascot falcon, used to conduct Apollo 15’s famous “hammer-feather drop” experiment;
a small aluminum sculpture, a tribute to the American and Soviet “fallen astronauts” who died in the space race—left by the crew of Apollo 15;
a patch from the never-launched Apollo 1 mission, which ended prematurely when flames engulfed the command module during a 1967 training exercise, killing three U.S. astronauts;
a small silicon disk bearing goodwill messages from 73 world leaders, and left on the moon by the crew of Apollo 11;
a silver pin, left by Apollo 12 astronaut Alan Bean;
a medal honoring Soviet cosmonauts Vladimir Komarov and Yuri Gagarin; and
a cast golden olive branch left by the crew of Apollo 11.
In the 2022 movie Moonshot, we sent Martian trash back to Earth. But that was not the case with the Moon. And now China and Russia are clamoring to do the same in the near future. Will the Moon someday be marked with more trash heaps than craters?
One might argue that explorers throughout time have had to leave something behind. Think of the piles of trash as well as corpses left on the top of Mount Everest. The great sea explorers also left plenty of men, material, and ships at the bottom of the sea where they would remain unclaimed.
But the interesting part of the Vox story is the potential of life remaining in that trash and even producing new life. If such biological material can seed new life, then who can say whether the Earth was simply a rest stop for aliens on their way somewhere else, and we are the product of their poop.
One more thing. If we do manage to let the Earth slip away from us and flip into another Venusian nightmare, the Moon poop may be the only human biology for a future alien to analyze. We sent the Voyager and other spacecraft out into the void with recordings and data, but no one thought about adding a biological component. Well, now we have that surviving piece on the Moon should it be needed. If we can figure out what a Tyrannosaurus was eating millions of years ago, maybe future visitors can figure out what the astronauts were eating in 20th century Texas.
Intense stuff, and worth reading about when you have a moment.
Our Awesome Universe 