Here’s Lake Mead’s Record Low Water Levels Seen From Space

How bad is the drought in the western United States? A stunning depiction of the record dry spell comes in images of Lake Mead, the reservoir formed by the Hoover Dam on the Colorado River. NASA satellite images, below, from Landsat 7 and Landsat 8 show the difference in lake levels between August 2000 and August 2021.

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A new Assessment of the World’s Climate is out. The News Isn’t Good

In 2014, the UN Intergovernmental Panel on Climate Change (IPCC) released its Fifth Assessment Report (AR5). As with previous reports, AR5 contained the latest findings of Climate Change experts from all relevant disciplines, as well as projections about the near future. In short, the AR5 and its predecessors were assessments of the impact anthropogenic Climate Change was having on the planet and how we could avoid worst-case scenarios.

On Aug. 9th, 2021, the IPCC released a report titled Climate Change 2021: the Physical Science Basis. Combining the latest advances in climate science and multiple lines of evidence, this first report paints a rather bleak picture of the remainder of the 21st century. At the same time, it presents a call to action and shows how mitigation strategies and reducing greenhouse gas emissions will ensure a better future for all.

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Animals Could Have Been Around Hundreds of Millions of Years Earlier Than Previously Believed

According to the most widely accepted theories, evolutionary biologists assert that life on Earth began roughly 4 billion years ago, beginning with single-celled bacteria and gradually giving way to more complex organisms. According to this same evolutionary timetable, the first complex organisms emerged during the Neoproterozoic era (ca. 800 million years ago), which took the form of fungi, algae, cyanobacteria, and sponges.

However, due to recent findings made in the Arctic Circle, it appears that sponges may have existed in Earth’s oceans hundreds of millions of years earlier than we thought! These findings were made by Prof. Elizabeth Turner of Laurentian University, who unearthed what could be the fossilized remains of sponges that are 890 million years old. If confirmed, these samples would predate the oldest fossilized sponges by around 350 million years.

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Juno Captured This Image of Earth on its Way Out to Jupiter Back in 2013

Since the Juno spacecraft has been in orbit around Jupiter for nearly five years — since July 4, 2016 — you may have forgotten about that time back in 2013 Juno flew past Earth. The spacecraft needed a little extra boost to reach Jupiter, so it used Earth for a gravity assist. Image editor Kevin Gill reminded us of that flyby with some stunning newly processed images of Earth, taken by the JunoCam, the “citizen science” camera on board. Pale blue dot indeed!

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This is Currently the World’s Largest Iceberg

A gigantic chunk of ice recently broke off from an ice shelf in Antarctica, and is currently the world’s largest iceberg. The iceberg, dubbed A-76, measures around 4,320 square km (1,670 square miles) in size. At 170 km (106 miles) in length and 25 km (15 miles) wide, the iceberg is slightly larger than the Spanish island of Majorca, and bigger than the state of Rhode Island in the US.

A-76 was captured in the above image by ESA’s Copernicus Sentinel-1 satellite. Below is an animation of the iceberg calving off the Ronne Ice Shelf.

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100-meter Asteroid Created a Strange Impact Event in Antarctica 430,000 Years Ago

The effects of ancient asteroid impacts on Earth are still evident from the variety of impact craters across our planet. And from the Chelyabinsk event back in 2013, where an asteroid exploded in the air above a Russian town, we know how devastating an “airburst” event can be.

Now, researchers in Antarctica have discovered evidence of a strange intermediate-type event – a combination of an impact and an airburst. The event was so devastating, its effects are still apparent even though it took place 430,000 years ago.

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A Billion Years From now There won’t be Much Oxygen in the Earth’s Atmosphere

Breathe it while you still can. A new research study forecasts the future of oxygen in the Earth’s atmosphere and finds grim news. As the sun continues to warm, carbon dioxide will bind to rocks. This will starve plants, and in as little as a billion years they won’t be able to produce enough oxygen to keep our planet habitable (for us).

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Lightning Strikes Helped Life get an Early Start on Earth

So, you want to create life? You’re going to need some ingredients first. On Earth four billion years ago, you might find some of those ingredients in the impact craters of asteroid strikes (as long as you don’t get blown up in the blast yourself). A safer place to look, according to new research from the University of Leeds, might be in the sites of lightning strikes. Lightning is less destructive, more common, and creates equally useful minerals out of which you can build your early, single cellular life forms.

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It Turns Out That the World’s Oldest Impact Crater Isn’t an Impact Crater

In early 2012, an international research team surveying parts of southwestern Greenland announced that they had discovered the oldest impact crater ever discovered on Earth, estimated at 3.3 billion years old. Now, new research shows that the strange geological feature – known as the Maniitsoq structure – is probably the result of Earthly geological processes, rather than a meteorite impact.

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