Using images and thermal data collected by NASA's Lunar Reconnaissance Orbiter (LRO), Southwest Research Institute scientists and their collaborators have calculated the ages of large lunar craters across the moon to be less than 1 billion years. By comparing the impact history of the moon with Earth's craters over this interval, they discovered that the rate of sizable asteroid collisions has increased by a factor of two to three on both bodies over the last 290 million years.
Variations in the axial tilt of the Earth have significant implications for the rise and fall of the Antarctic Ice Sheet, the miles-deep blanket of ice that locks up huge volumes of water that, if melted, would dramatically elevate sea level and alter the world's coastlines. New research matches the geologic record of Antarctica's ice with the periodic astronomical motions of the Earth.
A Japanese research group has identified a giant streak structure among the clouds covering planet Venus based on observation from the spacecraft Akatsuki. The team also revealed the origins of this structure using large-scale climate simulations. The group was led by Project Assistant Professor Hiroki Kashimura (Kobe University, Graduate School of Science) and these findings were published on Jan. 9, 2019, in Nature Communications.
Long ago in a galaxy far, far away, fewer galaxies were born than expected -- and that could create new questions for galaxy physics, according to a new University of Michigan study.
Winter snows in the Sierra Nevada Mountains create the snowpacks that serve as a primary water source for the western US. Due to rising average temperatures, snowpacks in the Great Basin appear to be transitioning from seasonal (predictable amount and melt rate), to 'ephemeral,' (short-lived, less predictable). Ephemeral snow has been poorly tracked and understood. Research by a former University of Nevada, Reno graduate student and her professors are shedding some light on the subject.
Meteor burst communication is based on using meteors as cryptography assistants. Meteor trails reflect radio waves, which makes them suitable for radio transmissions at distances of up to 2,000 kilometers. Unpredictable nature of meteors makes pose a significant hindrance for signal interception.
Tropical Cyclone Cilida appeared as a large and powerful hurricane on imagery from NASA-NOAA's Suomi NPP satellite on Dec. 21. Cilida is located north of the island of Mauritius in the Southern Indian Ocean.
Tropical Cyclone Kenanga is now on a weakening trend and NASA's GPM core satellite provided a look at the rainfall and cloud heights within the storm.
New University of Utah research found that dust deposition speeds up snowmelt in Utah's Wasatch Mountains. Scientists found that a single dust storm on April 13, 2017, deposited half of all dust for the season. The additional sunlight absorbed by the dust-darkened snow surface led to snow melting a week earlier.
The Southern Indian Ocean is seeing double. Tropical Cyclone Kenanga was one of two storms at Category 2 hurricane strength in the Southern Indian Ocean on Dec. 20. Kenanga was sporting an eye on visible imagery from NASA-NOAA's Suomi NPP satellite, and so was Tropical Cyclone Cilida, located west of Kenanga.