Connect with us

During the 1960s, the first robotic explorers began making flybys of Venus, including the Soviet Venera 1 and the Mariner 2 probes. These missions dispelled the popular myth that Venus was shrouded by dense rain clouds and had a tropical environment. Instead, these and subsequent missions revealed an extremely dense atmosphere predominantly composed of carbon dioxide. The few Venera landers that made it to the surface also confirmed that Venus is the hottest planet in the Solar System, with average temperatures of 464 °C (867 °F).

These findings drew attention to anthropogenic climate change and the possibility that something similar could happen on Earth. In a recent study, a team of astronomers from the University of Geneva (UNIGE) created the world’s first simulation of the entire greenhouse process that can turn a temperate planet suitable for Life into a hellish, hostile one. Their findings revealed that on Earth, a global average temperature rise of just a few tens of degrees (coupled with a slight rise in the Sun’s luminosity) would be sufficient to initiate this phenomenon and render our planet uninhabitable.

The study was conducted by Guillaume Chaverot and Emeline Bolmont, a postdoctoral scholar and an Astrophysics Professor with the Observatoire Astronomique de l’Université de Genève (UNIGE) and its Life in the Universe Center (LUC) (respectively). They were joined by Martin Turbet, a research scientist with UNIGE, the Laboratoire de Météorologie Dynamique (LMD), and the Laboratoire d’Astrophysique de Bordeaux (LAB). The paper that describes their simulation and research findings recently appeared in Astronomy & Astrophysics.

Venus Earth size comparison 1 jpg
Just a few degrees difference in temperature can trigger a runaway greenhouse effect, according to new research. Credit: NASA

Triggering the Effect

Belmont is the director of the LUC, which leads state-of-the-art interdisciplinary research projects regarding the origins of Life on Earth and other planets. According to the team’s simulations, the key to a runaway greenhouse effect is the water content of an atmosphere. Water vapor prevents solar irradiation absorbed by Earth’s surface from being radiated back to space as thermal radiation, effectively trapping heat in our atmosphere. While a limited greenhouse effect is essential for maintaining stable temperatures and habitability, too much will increase ocean evaporation and (therefore) the level of water vapor in the atmosphere.

In previous climatological studies, researchers have focused on either the planet’s conditions before the runaway greenhouse effect or its inhabitable state after the runaway occurred. What Chaverot and his colleagues did was create the first-ever 3D global climate model that examines the transition itself and how the climate and the atmosphere evolve during that process. One of the key points in this transition involves the appearance of a specific cloud pattern that increases the runaway effect and makes the process irreversible.

Based on their new climate models, the team determined that a very small increase in solar irradiation, causing an average global temperature increase of a few tens of degrees, would be enough to trigger this irreversible runaway greenhouse effect on Earth. As Chaverot explained in a UNIGE press release:

“There is a critical threshold for this amount of water vapor, beyond which the planet cannot cool down anymore. From there, everything gets carried away until the oceans end up getting fully evaporated and the temperature reaches several hundred degrees.”

“From the start of the transition, we can observe some very dense clouds developing in the high atmosphere. Actually, the latter does not display anymore the temperature inversion characteristic of the Earth atmosphere and separating its two main layers: the troposphere and the stratosphere. The structure of the atmosphere is deeply altered.”

Rocky exoplanet TRAPPIST 1 b temperature comparison articleDid you miss our previous article…
https://mansbrand.com/enjoy-the-holiday-themed-christmas-tree-cluster/

Continue Reading

Frontier Adventure

8 Epic Grand Canyon Backpacking Trips You Must Do

Tet19 047 Me on Teton Crest Trail copy cropped 18

By Michael Lanza

This is, in a way, a story about addiction. Or a love affair. Or both. Those metaphors best describe how the Grand Canyon constantly lures me back when I’m thinking about spring and fall hiking and backpacking trips.

It is that rare kind of natural environment that exists on a scale of its own, like Alaska or the Himalaya. There’s something soul-stirring and hypnotic about its infinite vistas, the deceptive immensity of the canyon walls and stone towers, and the way the foreground and background continually expand and shrink as you ascend and descend elevation gradients of a vertical mile or more—all of which validates enduring the wilting heat and trails that sometimes seem better suited to rattlesnakes and scorpions than bipedal primates.

For backpackers seeking adventure, challenge, and incomparable natural beauty, the canyon stands alone.

This story will show you, in words and photos, why one or more of these Big Ditch backpacking trips deserves top priority as you’re planning your next trip. I think you will quickly understand why the Grand Canyon has increasingly become one of my favorite places over more than three decades (and counting) of backpacking, including the 10 years I spent as a longtime field editor for Backpacker magazine and even longer running this blog.

Tet19 047 Me on Teton Crest Trail copy cropped 19
Hi, I’m Michael Lanza, creator of The Big Outside. Click here to sign up for my FREE email newsletter. Join The Big Outside to get full access to all of my blog’s stories. Click here for my e-guides to classic backpacking trips. Click here to learn how I can help you plan your next trip.

A backpacker at Ooh-Ah Point on the South Kaibab Trail in the Grand Canyon.
” data-image-caption=”Todd Arndt at Ooh-Ah Point on the South Kaibab Trail. Click on the photo to see my e-book “The Best Backpacking Trip in the Grand Canyon.”
” data-medium-file=”https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2019/10/06231753/Gran8-003-Todd-Arndt-at-Ooh-Ah-Point-South-Kaibab-Trail-Grand-Canyon..jpg?fit=300%2C200&ssl=1″ data-large-file=”https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2019/10/06231753/Gran8-003-Todd-Arndt-at-Ooh-Ah-Point-South-Kaibab-Trail-Grand-Canyon..jpg?fit=900%2C600&ssl=1″ src=”https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2019/10/06231753/Gran8-003-Todd-Arndt-at-Ooh-Ah-Point-South-Kaibab-Trail-Grand-Canyon..jpg?resize=900%2C600&ssl=1″ alt=”A backpacker at Ooh-Ah Point on the South Kaibab Trail in the Grand Canyon.” class=”wp-image-36039″ srcset=”https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2019/10/06231753/Gran8-003-Todd-Arndt-at-Ooh-Ah-Point-South-Kaibab-Trail-Grand-Canyon..jpg?resize=900%2C600&ssl=1 1200w, https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2019/10/06231753/Gran8-003-Todd-Arndt-at-Ooh-Ah-Point-South-Kaibab-Trail-Grand-Canyon..jpg?resize=900%2C600&ssl=1 300w, https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2019/10/06231753/Gran8-003-Todd-Arndt-at-Ooh-Ah-Point-South-Kaibab-Trail-Grand-Canyon..jpg?resize=900%2C600&ssl=1 768w, https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2019/10/06231753/Gran8-003-Todd-Arndt-at-Ooh-Ah-Point-South-Kaibab-Trail-Grand-Canyon..jpg?resize=900%2C600&ssl=1 1024w, https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2019/10/06231753/Gran8-003-Todd-Arndt-at-Ooh-Ah-Point-South-Kaibab-Trail-Grand-Canyon..jpg?resize=900%2C600&ssl=1 1080w” sizes=”(max-width: 900px) 100vw, 900px” data-recalc-dims=”1″ />Todd Arndt at Ooh-Ah Point on the South Kaibab Trail. Click on the photo to see my e-book “The Best Backpacking Trip in the Grand Canyon.”

And the time to start planning your
Did you miss our previous article…
https://mansbrand.com/juno-reveals-a-giant-lava-lake-on-io/

Continue Reading

Frontier Adventure

Juno Reveals a Giant Lava Lake on Io

JNCE 2024034 58C00025 V01.point

NASA’s Juno spacecraft came within 1,500 km (930 miles) of the surface of Jupiter’s moon Io in two recent flybys. That’s close enough to reveal new details on the surface of this moon, the most volcanic object in the Solar System. Not only did Juno capture volcanic activity, but scientists were also able to create a visual animation from the data that shows what Io’s 200-km-long lava lake Loki Patera would look like if you could get even closer. There are islands at the center of a magma lake rimmed with hot lava. The lake’s surface is smooth as glass, like obsidian.

“Io is simply littered with volcanoes, and we caught a few of them in action,” said Juno principal investigator Scott Bolton during a news conference at the European Geophysical Union General Assembly in Vienna, Austria. “There is amazing detail showing these crazy islands embedded in the middle of a potentially magma lake rimmed with hot lava. The specular reflection our instruments recorded of the lake suggests parts of Io’s surface are as smooth as glass, reminiscent of volcanically created obsidian glass on Earth.”

This animation is an artist’s concept of Loki Patera, a lava lake on Jupiter’s moon Io, made using data from the JunoCam imager aboard NASA’s Juno spacecraft. With multiple islands in its interior, Loki is a depression filled with magma and rimmed with molten lava. Credit: NASA/JPL-Caltech/SwRI/MSSS

Just imagine if you could stand by the shores of this lake – which would be a stunning view in itself. But then, you could look up and see the giant Jupiter looming in the skies above you.

Juno made the two close flybys of Io in December 2023 and February 2024. Images from Juno’s JunoCam included the first close-up images of the moon’s northern latitudes. Undoubtedly, Io looks like a pizza – which has been the conclusion since our first views of this moon, when Voyager 1 flew through the Jupiter system in March 1979. The mottled and colorful surface comes from the volcanic activity, with hundreds of vents and calderas on the surface that create a variety of features. Volcanic plumes and lava flows across the surface show up in all sorts of colors, from red and yellow to orange and black. Some of the lava “rivers” stretch for hundreds of kilometers.

JNCE 2024034 58C00025 V01.point 1
Io’s sub-Jovian hemisphere is revealed in detail for the first time since Voyager 1 flew through the Jupiter system in March 1979, during the Juno spacecraft’s 58th perijove, or close pass, on February 3, 2024. This image shows Io’s nightside illuminated by sunlight reflected off Jupiter’s cloud tops. Several surface changes are visible include a reshaping of the compound flow field at Kanehekili (center left) and a new lava flow to the east of Kanehekili. This image has a pixel scale of 1.6 km/pixel. Credit : NASA/SwRI/JPL/MSSS/Jason Perry.

Juno scientists were also able to re-create a spectacular feature on Io, a spired mountain that has been nicknamed “The Steeple.” This feature is between 5 and 7 kilometers (3-4.3 miles) in height. It’s hard to comprehend the type of volcanic activity that could have created such a stunning landform.

Created using data collected by the JunoCam imager aboard NASA’s Juno during flybys in December 2023 and February 2024, this animation is an artist’s concept of a feature on the Jovian moon Io that the mission science team nicknamed “Steeple Mountain.” Credit: NASA/JPL-Caltech/SwRI/MSSS

Speaking of volcanic activity, two recent papers have come to a jaw-dropping conclusion about Io: this moon has been erupting since the dawn of the Solar System.

All the volcanic on Io is activity is driven by tidal heating. Io is in an orbital resonance with two other large moons of Jupiter, Europa and Ganymede.

“Every time Ganymede orbits Jupiter once, Europa orbits twice, and Io orbits four times,” explained the authors of a paper published in the Journal of Geophysical Research: Planets, led by Ery Hughes of GNS Science in New Zealand. “This situation causes tidal heating in Io (like how the Moon causes ocean tides on Earth), which causes the volcanism.”

However, scientists haven’t known how long this resonance has been occurring and whether what we observe today is what has always been happening in the Jupiter system. This is because volcanism renews Io’s surface almost

Continue Reading

Frontier Adventure

Artemis Astronauts Will Deploy New Seismometers on the Moon

fiber.width 450 193x250 1

Back in the 1960s and 1970s, Apollo astronauts set up a collection of lunar seismometers to detect possible Moon quakes. These instruments monitored lunar activity for eight years and gave planetary scientists an indirect glimpse into the Moon’s interior. Now, researchers are developing new methods for lunar quake detection techniques and technologies. If all goes well, the Artemis astronauts will deploy them when they return to the Moon.

fiber.width 450 193x250 2
Fiber optic cable is the heart of a seismology network to be deployed on the Moon by future Artemis astronauts.

The new approach, called distributed acoustic sensing (DAS), is the brainchild of CalTech geophysics professor Zhongwen Zhan. It sends laser beams through a fiber optic cable buried just below the surface. Instruments at either end measure how the laser light changes during the shake-induced tremors. Basically Zhan’s plan turns the cable into a sequence of hundreds of individual seismometers. That gives precise information about the strength and timing of the tremors. Amazingly, a 100-kilometer fiber optic cable would function as the equivalent of 10,000 seismometers. This cuts down on the number of individual seismic instruments astronauts would have to deploy. It probably also affords some cost savings as well.

A seismometer station deployed on the Moon during the Apollo 15 mission. Courtesy NASA.
A seismometer station deployed on the Moon during the Apollo 15 mission. Courtesy NASA.

DAS and Apollo on the Moon

Compare DAS the Apollo mission seismometer data and it becomes obvious very quickly that DAS is a vast improvement. In the Apollo days, the small collection of instruments left behind on the Moon provided information that was “noisy”. Essentially, when the seismic waves traveled through different parts of the lunar structure, they got scattered. This was particularly true when they encountered the dusty surface layer. The “noise” basically muddied up the signals.

Lunar seismic instruments Apollo 11214 2020 709 Fig6 HTML 436x580 1
The layout for the Apollo Lunar Seismic Profiling Experiment for the Apollo 17 mission. Courtesy Nunn, et al.

What DAS Does to Detect Quakes on the Moon

The DAS system stations laser emitters and data collectors at each end of a fiber optic cable. This allows for multiple widely spaced installations that measure light as it transits the network. The cable consists of glass strands, and each strand contains tiny imperfections. That sounds bad, but each imperfection provides a useful “waypoint” that reflects a little bit of the light back to the source. That information gets recorded as part of a larger data set. Setting up such a system of
Did you miss our previous article…
https://mansbrand.com/ice-deposits-on-ceres-might-only-be-a-few-thousand-years-old/

Continue Reading

Trending