Showing 20 articles starting at article 821

< Previous 20 articles        Next 20 articles >

Categories: Geoscience: Geography, Space: Astronomy

Return to the site home page

Space: Astronomy Space: Astrophysics Space: Cosmology Space: Exploration Space: General Space: Structures and Features
Published

Dwarf galaxies use 10-million-year quiet period to churn out stars      (via sciencedaily.com)     Original source 

If you look at massive galaxies teeming with stars, you might be forgiven in thinking they are star factories, churning out brilliant balls of gas. But actually, less evolved dwarf galaxies have bigger regions of star factories, with higher rates of star formation. Now, University of Michigan researchers have discovered the reason underlying this: These galaxies enjoy a 10-million-year delay in blowing out the gas cluttering up their environments. Star-forming regions are able to hang on to their gas and dust, allowing more stars to coalesce and evolve. In these relatively pristine dwarf galaxies, massive stars--stars about 20 to 200 times the mass of our sun--collapse into black holes instead of exploding as supernovae. But in more evolved, polluted galaxies, like our Milky Way, they are more likely to explode, thereby generating a collective superwind. Gas and dust get blasted out of the galaxy, and star formation quickly stops.   

Engineering: Robotics Research Geoscience: Geography Geoscience: Severe Weather Offbeat: Earth and Climate Offbeat: General Offbeat: Paleontology and Archeology
Published

AI finds formula on how to predict monster waves      (via sciencedaily.com)     Original source 

Using 700 years' worth of wave data from more than a billion waves, scientists have used artificial intelligence to find a formula for how to predict the occurrence of these maritime monsters. Long considered myth, freakishly large rogue waves are very real and can split apart ships and even damage oil rigs.

Space: Astronomy Space: Astrophysics Space: Cosmology Space: General Space: Structures and Features
Published

Why the vast supergalactic plane is teeming with only one type of galaxy      (via sciencedaily.com)     Original source 

Our own Milky Way galaxy is part of a much larger formation, the local Supercluster structure, which contains several massive galaxy clusters and thousands of individual galaxies. Due to its pancake-like shape, which measures almost a billion light years across, it is also referred to as the Supergalactic Plane. Why is the vast supergalactic plane teeming with only one type of galaxies? This old cosmic puzzle may now have been solved.

Environmental: General Environmental: Water Geoscience: Earth Science Geoscience: Environmental Issues Geoscience: Geochemistry Geoscience: Geography Geoscience: Geology Geoscience: Volcanoes
Published

Massive 2022 eruption reduced ozone layer levels      (via sciencedaily.com)     Original source 

The Hunga Tonga-Hunga Ha'apai volcano changed the chemistry and dynamics of the stratosphere in the year following the eruption, leading to unprecedented losses in the ozone layer of up to 7% over large areas of the Southern Hemisphere.  

Offbeat: General Offbeat: Space Space: Astronomy Space: Astrophysics Space: Cosmology Space: Exploration Space: General Space: Structures and Features
Published

'Teenage galaxies' are unusually hot, glowing with unexpected elements      (via sciencedaily.com)     Original source 

Using the James Webb Space Telescope, CECILIA Survey receives first data from galaxies forming two-to-three billion years after the Big Bang. By examining light from these 33 galaxies, researchers discovered their elemental composition and temperature. The ultra-deep spectrum revealed eight distinct elements: Hydrogen, helium, nitrogen, oxygen, silicon, sulfur, argon and nickel. The teenage galaxies also were extremely hot, reaching temperatures higher than 13,350 degrees Celsius.

Environmental: Ecosystems Environmental: General Environmental: Water Geoscience: Environmental Issues Geoscience: Geography
Published

Coastal river deltas threatened by more than climate change      (via sciencedaily.com)     Original source 

Worldwide, coastal river deltas are home to more than half a billion people, supporting fisheries, agriculture, cities, and fertile ecosystems. In a unique study covering 49 deltas globally, researchers have identified the most critical risks to deltas in the future. The research shows that deltas face multiple risks, and that population growth and poor environmental governance might pose bigger threats than climate change to the sustainability of Asian and African deltas, in particular.

Geoscience: Earth Science Geoscience: Environmental Issues Geoscience: Geography Geoscience: Geology Geoscience: Oceanography Geoscience: Severe Weather Paleontology: Climate Paleontology: General
Published

Deep dive on sea level rise: New modelling gives better predictions on Antarctic ice sheet melt      (via sciencedaily.com)     Original source 

Using historical records from around Australia, an international team of researchers have put forward the most accurate prediction to date of past Antarctic ice sheet melt, providing a more realistic forecast of future sea level rise.   The Antarctic ice sheet is the largest block of ice on earth, containing over 30 million cubic kilometers of water.   Hence, its melting could have a devasting impact on future sea levels. To find out just how big that impact might be, the research team turned to the past.  

Biology: Biochemistry Biology: Biotechnology Biology: Cell Biology Biology: Evolutionary Biology: General Biology: Genetics Biology: Zoology Ecology: Nature Geoscience: Geography
Published

Scientists have solved the damselfly color mystery      (via sciencedaily.com)     Original source 

For over 20 years, a research team has studied the common bluetail damselfly. Females occur in three different color forms -- one with a male-like appearance, something that protects them from mating harassment. In a new study, an international research team found that this genetic color variation that is shared between several species arose through changes in a specific genomic region at least five million years ago.

Environmental: General Environmental: Water Geoscience: Earth Science Geoscience: Geochemistry Geoscience: Geography Geoscience: Oceanography Paleontology: Fossils
Published

Research in Lake Superior reveals how sulfur might have cycled in Earth's ancient oceans      (via sciencedaily.com)     Original source 

A scientists has sulfur on her mind. The yellow element is a vital macronutrient, and she's trying to understand how it cycles through the environment. Specifically, she's curious about the sulfur cycle in Earth's ancient ocean, some 3 billion years ago.

Ecology: Nature Environmental: Ecosystems Environmental: General Geoscience: Environmental Issues Geoscience: Geography
Published

New global stocktake: Healthy forests could store much more carbon      (via sciencedaily.com)     Original source 

Natural carbon reservoirs will play a major role at the COP28 world climate conference in the United Arab Emirates. In a recent study, a team of more than two hundred researchers worldwide presents new estimates of the storage potential of forests around the globe. According to the study, forests could ideally absorb 328 billion tons (gigatons, Gt for short) of carbon. However, as many formerly forested areas are now used for agriculture and as settlement areas, the potential is reduced to 226 Gt. 139 Gt of this (61%) could be achieved by protecting existing forests alone. The remaining 87 Gt (39%) could be realized by reconnecting previously fragmented forest landscapes and managing them sustainably.

Biology: Biochemistry Biology: General Biology: Marine Ecology: Animals Ecology: Extinction Ecology: General Ecology: Invasive Species Ecology: Nature Ecology: Research Ecology: Sea Life Environmental: Biodiversity Environmental: General Environmental: Water Geoscience: Earth Science Geoscience: Environmental Issues Geoscience: Geography
Published

New study reveals huge potential for future waves of invasive species      (via sciencedaily.com)     Original source 

Human trade and transport have led to the intentional and accidental introductions of non-native species outside of their natural range globally. These biological invasions can cause extinctions, cost trillions, and spread diseases. A study has investigated how many of these non-native species already exist worldwide and which species groups are particularly prone to become non-native.

Ecology: Sea Life Geoscience: Earth Science Geoscience: Geography
Published

WhaleVis turns more than a century of whaling data into an interactive map      (via sciencedaily.com)     Original source 

A team has created an interactive dashboard called WhaleVis, which lets users map data on global whale catches and whaling routes from 1880 to 1986. Scientists can compare this historical data and its trends with current information to better understand whale populations over time.

Ecology: General Environmental: Ecosystems Environmental: General Geoscience: Environmental Issues Geoscience: Geography Geoscience: Oceanography
Published

Climate change effects hit marine ecosystems in multiple waves, according to marine ecologists      (via sciencedaily.com)     Original source 

A new approach to examining the effects of climate change on marine ecosystems may provide a more accurate understanding of climate change responses -- and predictions for future consequences -- according to a new article. The paper highlights the interplay between the trend of climate warming and the fluctuations in local temperature. These two properties cause atypically warm events such as marine heatwaves to occur with increasing frequency and magnitude.

Environmental: General Geoscience: Earth Science Geoscience: Environmental Issues Geoscience: Geography Geoscience: Oceanography
Published

Ice cores from Earth's highest tropical peak provide insight into climate variability      (via sciencedaily.com)     Original source 

A new study examines ice cores from the summit of the highest tropical mountain in the world, and finds unique insight into the climate record of the Amazon Basin over the last six decades. 

Space: Astronomy Space: Astrophysics Space: Exploration Space: General Space: Structures and Features Space: The Solar System
Published

An old star with ring-like structure: ALMA demonstrates highest resolution yet      (via sciencedaily.com)     Original source 

ALMA (Atacama Large Millimeter/submillimeter Array) has demonstrated the highest resolution yet with observations of an old star. The observations show that the star is surrounded by a ring-like structure of gas and that gas from the star is escaping to the surrounding space. Future observations with the newly demonstrated high resolution are expected to elucidate, not only the end of a star's life, but also the beginning, when planets are still forming.

Chemistry: General Environmental: General Geoscience: Earth Science Geoscience: Environmental Issues Geoscience: Geochemistry Geoscience: Geography Geoscience: Oceanography
Published

Climate engineering could slow Antarctic ice loss, study suggests      (via sciencedaily.com)     Original source 

A study reports that scattering sunlight-reflecting particles in the atmosphere -- a theoretical form of climate engineering known as 'stratospheric aerosol injection' -- has potential to slow rapid ice melt in Western Antarctica.

Offbeat: General Offbeat: Space Space: Astronomy Space: Astrophysics Space: General Space: Structures and Features
Published

With unprecedented flares, stellar corpse shows signs of life      (via sciencedaily.com)     Original source 

After a distant star's explosive death, an active stellar corpse was the likely source of repeated energetic flares observed over several months -- a phenomenon astronomers had never seen before, astronomers report.