Glaciologists have been closely monitoring ice shelves in Antarctica for signs of cracks and chasms that indicate breakups. The loss of ice around the Earth’s polar regions is one of many consequences of climate change, which is leading to rising ocean levels and various feedback mechanisms. Recently, the ESA’s Copernicus Sentinel-1 satellite witnessed a giant iceberg breaking off from Antarctica’s Brunt Ice Shelf on February 26th.
The Copernicus Sentinel mission consists of two polar-orbiting satellites that rely on C-band synthetic aperture radar imaging to conduct Earth observations in all weather conditions. In recent years, it has been monitoring the Brunt Ice Shelf for signs of cracks and chasms. According to the images it recently captured, an iceberg larger than New York City broke free and began floating out to sea.
Continue reading “Another Big Iceberg Just Broke off from Antarctica”
Iceberg A-68A, the massive frigid behemoth posing a threat to South Georgia Island, might be breaking into pieces. Satellite images from the European Space Agency showed large cracks forming in the iceberg.
Now it appears to breaking apart.
Continue reading “It Looks Like Iceberg A-68A is Coming Apart”
According to multiple sources – which includes NASA, the NOAA, the Berkeley Earth research group, and the Met Office Hadley Centre (UK) – global temperatures over the past few years have been some of the hottest on record. This is the direct result of anthropogenic factors like overpopulation, urbanization, deforestation, and increased greenhouse gas emissions (like carbon dioxide and methane).
According to a recent press release from NASA, in terms of global temperatures, 2020 was the hottest year on record – effectively tying it with 2016 (the previous record-holder). The release includes a dramatic video that illustrates average temperature increases since 1880 and the ecological crises that have taken place just this past year. This is yet another warning of how human agency is impacting the very systems we depend upon for our continued survival.
Continue reading “2020 Ties for the Hottest Year on Record”
The Sun has a lot of rhythm and goes through different cycles of activity. The most well-known cycle might be the Schwabe cycle, which has an 11-year cadence. But what about cycles with much longer time scales? How can scientists understand them?
As it turns out, the Sun has left some hidden clues in tree rings.
Continue reading “Tree Rings Reveal 1,000 Years of Solar Activity”
Like Earth, Mars has experienced periods of extreme glaciation or ice sheet coverage, which are known as ice ages. As these ice ages come and go, glaciers expand and contract along the planet’s surface, grinding huge boulders down to smaller rocks. By examining the size of boulders and rocks at specific locations on Mars, we should be able to understand the history of the Martian ice ages.
A new study did just that.
Continue reading “Mars has Been Through Many Ice Ages in the Last Billion Years”
Humanity can have a love/hate relationship with itself, but there’s no denying that we’re the pinnacle of evolution on Earth as things stand now. But it took an awfully long time for evolution to produce beings such as we. Several times, life had to drag itself back from near annihilation.
The largest extinction setback was the Permian-Triassic extinction, also called the “Great Dying,” some 252 million years ago. Up to 96% of all marine species and 70% of terrestrial vertebrate species went extinct.
Continue reading “Scientists Think They Know What Caused the Deadliest Mass Extinction in the History of the Earth”
We can thank NASA’s New Horizons spacecraft for opening our eyes up to Pluto’s complexity. On July 14th, 2015, the spacecraft came within 12,500 km (7,800 mi) of the dwarf planet. During the flyby, New Horizons was able to characterize Pluto’s atmosphere and its surface.
Among the things New Horizons saw was a region of snowcapped mountains.
Continue reading “Pluto has Snowcapped Mountains, But Why?”
Modern astronomical telescopes are extraordinarly powerful. And we keep making them more powerful. With telescopes like the Extremely Large Telescope and the Giant Magellan Telescope seeing first light in the coming years, our astronomical observing power will be greater than ever.
But a new commentary says that climate change could limit the power of our astronomical observatories.
Continue reading “Climate Change is Making the Atmosphere Worse for Astronomy”
Hundreds of millions of years ago, Earth went through two episodes of severe glaciation. These two episodes—the Sturtian and the Marinoan glaciations—occured during the Earth’s Cryogenian Period. The Cryogenian lasted from about 720 million to 635 million years ago.
The phenomenon is called “Snowball Earth” and both instances of it happened in pretty quick succession. And while a planet encased in ice and snow sounds devastating, these episodes may have paved the way for the development of complex life.
The question is, what caused the Earth to freeze over like that?
Continue reading “Did Snowball Earth Happen Because of a Sudden Drop in Sunlight?”
Orbiters are giving us a chance to study the surface of Mars closely, and some of the features that pop to prominence are dry river channels. There are over 10,000 of them. But a new study suggests that glaciers on ancient Mars are responsible for many of them.
According to the study, those glaciers and the water flowing under them are resonsible for carving out some of those riverbeds, rather than free-flowing rivers.
Continue reading “Martian Features Were Carved by Glaciers, not Flowing Rivers”