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Mars at Opposition 2022: The Full Moon Occults Mars Wednesday Night



A rare event transpires Wednesday night, as the Full Moon occults Mars near opposition.

Have you checked out Mars lately? The Red Planet currently rides high to the east at dusk, rising as the Sun sets. We call this opposition season, the biannual span when Mars passes closest to the Earth and offers observers optimal views of the planet. Mars opposition 2022 is special however, as three events converge in one night: Mars at opposition, the Moon reaches Full, and the Moon occults (passes in front of) Mars, all on the evening/morning of Wednesday/Thursday, December 7th/8th.


Note that Mars is closest to the Earth a week prior to the opposition. This occurs for two reasons: while the Earth is moving towards perihelion in January (that is, we’re moving towards the Sun in December, but away from Mars), the Red Planet is doing the opposite, headed towards aphelion on May 30, 2023, just under six months after this week’s opposition. This makes up for the 900,000-odd kilometre difference as Mars is 0.55 Astronomical Units (AU, or 81.5 million kilometers) from Earth on the 1st, but sits 82.4 million kilometers from Earth at opposition.

Mars from November 21st as it nears opposition. Image credit and copyright: Damian Peach.

In fact, we’re currently trending towards a cycle of unfavorable oppositions for Mars now, which will bottom out in February 2027 when Mars only reaches an apparent diameter of 13.8” as seen from the Earth. After 2027, Mars oppositions will slowly start to become more favorable again.

No Missions to Mars

Unfortunately, this Mars launch window also marks a sad milestone: for the first time since 2009, no mission will catch the biannual pre-opposition window to head to Mars. The European Space Agency’s ExoMars Rosalind Franklin rover was set to make the trip until Russia invaded Ukraine early this year, forcing ESA to look for another launch carrier and lander. ESA still hopes to get the rover to Mars by 2030.

The occultation visibility footprint for Wednesday night’s event. Credit: Occult 4.2.

‘Standing in the Shadow’ as the Moon occults Mars

But it’s Wednesday night’s occultation of Mars by the Full Moon that makes the 2022 opposition special. Opposition and the occultation plus the Full Moon all occur within an hour of each other. This is pretty rare: the near-Full Moon hasn’t occulted a naked eye planet or bright star since July 2019 (Saturn) and won’t do so again until May 24, 2024 (Antares), This is also the last of two occultations of Mars by the Moon for 2022, The Moon will occult Mars five times in 2023, though none are as favorable as the December’s event. The December ‘Long Night’s Moon’ nearest to the southward equinox also rides high in the sky for northern hemisphere observers, another plus.

Dec 6
Tuesday, December 6th at dusk, looking eastward. Credit: Stellarium.

This is also the closest Mars opposition versus a Full Moon with a lunar occultation for the 21st century. 21st century occultations of Mars near (less than 24 hours) from Full Moon also occur on December 24, 2007, January 14, 2025, February 5, 2042, May 28, 2048, February 27, 2059, and finally on April 27th 2078, which also features a shallow penumbral lunar eclipse.

The lunar occultation ‘footprint’ for Wednesday night’s occultation spans most of North America and Europe, with only the southeast U.S. missing out. Mars is 17” across during the event, shining at magnitude -1.9. The Moon will take just over half a minute to cover Mars during the occultation.

A sped up view of Wednesday night’s occultation event. Credit: Stellarium.

When to Watch

Here’s a table for select North American and European cities in the path of the occultation, with ingress/egress times. You can see an extensive list of sites and times here.

City Ingress Egress
Detroit 3:20UT/10:20PM EST 4:09UT/11:09PM EST
Dallas 2:54UT/8:54PM CST 3:28UT/9:28PM CST
Los Angeles 2:30UT/6:30PM PST 3:30UT/7:30PM PST
Seattle 2:51UT/6:51PM PST 3:50UT/7:50PM PST
London 5:00UT/5:00AM BST 6:00UT/6:00 AM BST
Helsinki 4:55UT/6:55AM EET 5:39UT/7:39 AM EET
Table credit: Dave Dickinson.

Mars will be bright enough to follow riiiiiight up to the limb of the Full Moon during the event. The occultation occurs in the early morning hours for Europe on Thursday December 8th, and late in the evening of December 7th for North America. The disappearance of Mars behind the Moon will be visible even to the unaided eye, though binoculars or a small telescope will definitely help you enjoy the view.

Looking back from Mars, you’d be treated to an even stranger view, as the Moon transits the slim crescent Earth, just scant degrees from the Sun.

Moon transit
The Moon transits the Earth Wednesday night, as seen from Mars. Credit: Starry Night.

The Moon occults Mars: Weather Prospects, Watching Live

As of writing this, weather prospects for the contiguous United States (CONUS) look to favor the central northern states and the U.S. southwest.

Wx prospects
Weather prospects across CONUS for Wednesday night’s occultation. Credit: NOAA.

Clouded out or simply live outside of the occultation footprint? Astronomer Gianluca Masi has you covered, with a live webcast as the Moon occults Mars, starting at 4:00 UT/11:00 PM EST Wednesday night.

Mars near the crescent Moon from 2020. Image credit and copyright: Efrain Morales Rivera.

The Moon Occults Mars: Spotting a ‘Daytime’ Red Planet

Finally… ever seen Mars in the daytime? It’s certainly possible near opposition… and the nearby Full Moon offers an excellent guide to complete this unusual feat of visual athletics. In North America, I’d start looking for Mars near the Moon just before local sunset, while in Europe, your best bet is to follow Mars near the Moon low to the West, after local sunrise.

Good luck, clear skies, and don’t miss this week’s unique, triple play dance of the Moon and Mars.


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Rare ‘big fuzzy green ball’ comet visible in B.C. skies, a 50000-year sight



In the night sky, a comet is flying by Earth for the first time in 50,000 years.

Steve Coleopy, of the South Cariboo Astronomy Club, is offering some tips on how to see it before it disappears.

The green-coloured comet, named C/2022 E3 (ZTF), is not readily visible to the naked eye, although someone with good eyesight in really dark skies might be able to see it, he said. The only problem is it’s getting less visible by the day.

“Right now the comet is the closest to earth and is travelling rapidly away,” Coleopy said, noting it is easily seen through binoculars and small telescopes. “I have not been very successful in taking a picture of it yet, because it’s so faint, but will keep trying, weather permitting.”


At the moment, the comet is located between the bowl of the Big Dipper and the North Star but will be moving toward the Planet Mars – a steady orange-coloured point of light- in the night sky over the next couple of weeks, according to Coleopy.

“I have found it best to view the comet after 3:30 in the morning, after the moon sets,” he said. “It is still visible in binoculars even with the moon still up, but the view is more washed out because of the moonlight.”

He noted the comet looks like a “big fuzzy green ball,” as opposed to the bright pinpoint light of the stars.

“There’s not much of a tail, but if you can look through the binoculars for a short period of time, enough for your eyes to acclimatize to the image, it’s quite spectacular.”

To know its more precise location on a particular evening, an internet search will produce drawings and pictures of the comet with dates of where and when the comet will be in each daily location.

Coleopy notes the comet will only be visible for a few more weeks, and then it won’t return for about 50,000 years.


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Extreme species deficit of nitrogen-converting microbes in European lakes



Sampling of Lake Constance water from 85 m depth, in which ammonia-oxidizing archaea make up as much as 40% of all microorganisms

Dr. David Kamanda Ngugi, environmental microbiologist at the Leibniz Institute DSMZ


Leibniz Institute DSMZ


An international team of researchers led by microbiologists from the Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures GmbH in Braunschweig, Germany, shows that in the depths of European lakes, the detoxification of ammonium is ensured by an extremely low biodiversity of archaea. The researchers recently published their findings in the prestigious international journal Science Advances. The team led by environmental microbiologists from the Leibniz Institute DSMZ has now shown that the species diversity of these archaea in lakes around the world ranges from 1 to 15 species. This is of particularly concern in the context of global biodiversity loss and the UN Biodiversity Conference held in Montreal, Canada, in December 2022. Lakes play an important role in providing freshwater for drinking, inland fisheries, and recreation. These ecosystem services would be at danger from ammonium enrichment. Ammonium is an essential component of agricultural fertilizers and contributes to its remarkable increase in environmental concentrations and the overall im-balance of the global nitrogen cycle. Nutrient-poor lakes with large water masses (such as Lake Constance and many other pre-alpine lakes) harbor enormously large populations of archaea, a unique class of microorganisms. In sediments and other low-oxygen environments, these archaea convert ammonium to nitrate, which is then converted to inert dinitrogen gas, an essential component of the air. In this way, they contribute to the detoxification of ammonium in the aquatic environment. In fact, the species predominant in European lakes is even clonal and shows low genetic microdiversity between different lakes. This low species diversity contrasts with marine ecosystems where this group of microorganisms predominates with much greater species richness, making the stability of ecosystem function provided by these nitrogen-converting archaea potentially vulnerable to environmental change.

Maintenance of drinking water quality
Although there is a lot of water on our planet, only 2.5% of it is fresh water. Since much of this fresh water is stored in glaciers and polar ice caps, only about 80% of it is even accessible to us humans. About 36% of drinking water in the European Union is obtained from surface waters. It is therefore crucial to understand how environmental processes such as microbial nitrification maintain this ecosystem service. The rate-determining phase of nitrification is the oxidation of ammonia, which prevents the accumulation of ammonium and converts it to nitrate via nitrite. In this way, ammonium is prevented from contaminating water sources and is necessary for its final conversion to the harmless dinitrogen gas. In this study, deep lakes on five different continents were investigated to assess the richness and evolutionary history of ammonia-oxidizing archaea. Organisms from marine habitats have traditionally colonized freshwater ecosystems. However, these archaea have had to make significant changes in their cell composition, possible only a few times during evolution, when they moved from marine habitats to freshwaters with much lower salt concentrations. The researchers identified this selection pressure as the major barrier to greater diversity of ammonia-oxidizing archaea colonizing freshwaters. The researchers were also able to determine when the few freshwater archaea first appeared. Ac-cording to the study, the dominant archaeal species in European lakes emerged only about 13 million years ago, which is quite consistent with the evolutionary history of the European lakes studied.

Slowed evolution of freshwater archaea
The major freshwater species in Europe changed relatively little over the 13 million years and spread almost clonally across Europe and Asia, which puzzled the researchers. Currently, there are not many examples of such an evolutionary break over such long time periods and over large intercontinental ranges. The authors suggest that the main factor slowing the rapid growth rates and associated evolutionary changes is the low temperatures (4 °C) at the bottom of the lakes studied. As a result, these archaea are restricted to a state of low genetic diversity. It is unclear how the extremely species-poor and evolutionarily static freshwater archaea will respond to changes induced by global climate warming and eutrophication of nearby agricultur-al lands, as the effects of climate change are more pronounced in freshwater than in marine habitats, which is associated with a loss of biodiversity.

Publication: Ngugi DK, Salcher MM, Andre A-S, Ghai R., Klotz F, Chiriac M-C, Ionescu D, Büsing P, Grossart H-S, Xing P, Priscu JC, Alymkulov S, Pester M. 2022. Postglacial adaptations enabled coloniza-tion and quasi-clonal dispersal of ammonia oxidizing archaea in modern European large lakes. Science Advances:

Press contact:
PhDr. Sven-David Müller, Head of Public Relations, Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures GmbH
Phone: ++49 (0)531/2616-300

About the Leibniz Institute DSMZ
The Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures is the world’s most diverse collection of biological resources (bacteria, archaea, protists, yeasts, fungi, bacteriophages, plant viruses, genomic bacterial DNA as well as human and animal cell lines). Microorganisms and cell cultures are collected, investigated and archived at the DSMZ. As an institution of the Leibniz Association, the DSMZ with its extensive scientific services and biological resources has been a global partner for research, science and industry since 1969. The DSMZ was the first registered collection in Europe (Regulation (EU) No. 511/2014) and is certified according to the quality standard ISO 9001:2015. As a patent depository, it offers the only possibility in Germany to deposit biological material in accordance with the requirements of the Budapest Treaty. In addition to scientific services, research is the second pillar of the DSMZ. The institute, located on the Science Campus Braunschweig-Süd, accommodates more than 82,000 cultures and biomaterials and has around 200 employees.

PhDr. Sven David Mueller, M.Sc.
Leibniz-Institut DSMZ
+49 531 2616300
email us here
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Scientists are closing in on why the universe exists



Particle astrophysicist Benjamin Tam hopes his work will help us understand a question. A very big one.

“The big question that we are trying to answer with this research is how the universe was formed,” said Tam, who is finishing his PhD at Queen’s University.

“What is the origin of the universe?”

And to answer that question, he and dozens of fellow scientists and engineers are conducting a multi-million dollar experiment two kilometres below the surface of the Canadian Shield in a repurposed mine near Sudbury, Ontario.

Ten thousand light-sensitive cameras send data to scientists watching for evidence of a neutrino bumping into another particle. (Tom Howell/CBC)

The Sudbury Neutrino Observatory (SNOLAB) is already famous for an earlier experiment that revealed how neutrinos ‘oscillate’ between different versions of themselves as they travel here from the sun.

This finding proved a vital point: the mass of a neutrino cannot be zero. The experiment’s lead scientist, Arthur McDonald, shared the Nobel Prize in 2015 for this discovery.

The neutrino is commonly known as the ‘ghost particle.’ Trillions upon trillions of them emanate from the sun every second. To humans, they are imperceptible except through highly specialized detection technology that alerts us to their presence.

Neutrinos were first hypothesized in the early 20th century to explain why certain important physics equations consistently produced what looked like the wrong answers. In 1956, they were proven to exist.

A digital image of a sphere that is blue and transparent with lines all over.
The neutrino detector is at the heart of the SNO+ experiment. An acrylic sphere containing ‘scintillator’ liquid is suspended inside a larger water-filled globe studded with 10,000 light-sensitive cameras. (Submitted by SNOLOAB)

Tam and his fellow researchers are now homing in on the biggest remaining mystery about these tiny particles.

Nobody knows what happens when two neutrinos collide. If it can be shown that they sometimes zap each other out of existence, scientists could conclude that a neutrino acts as its own ‘antiparticle’.

Such a conclusion would explain how an imbalance arose between matter and anti-matter, thus clarifying the current existence of all the matter in the universe.

It would also offer some relief to those hoping to describe the physical world using a model that does not imply none of us should be here.

A screengrab of two scientists wearing white hard hat helmets, clear googles and blue safety suits standing on either side of CBC producer holding a microphone. All three people are laughing.
IDEAS producer Tom Howell (centre) joins research scientist Erica Caden (left) and Benjamin Tam on a video call from their underground lab. (Screengrab: Nicola Luksic)

Guests in this episode (in order of appearance):

Benjamin Tam is a PhD student in Particle Astrophysics at Queen’s University.

Eve Vavagiakis is a National Science Foundation Astronomy and Astrophysics Postdoctoral Fellow in the Physics Department at Cornell University. She’s the author of a children’s book, I’m A Neutrino: Tiny Particles in a Big Universe.

Blaire Flynn is the senior education and outreach officer at SNOLAB.

Erica Caden is a research scientist at SNOLAB. Among her duties she is the detector manager for SNO+, responsible for keeping things running day to day.

*This episode was produced by Nicola Luksic and Tom Howell. It is part of an on-going series, IDEAS from the Trenches, some stories are below.


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