Using NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton satellite, astronomers have investigated unusual X-ray activity in three white dwarfs: KPD 0005+5106, PG 1159-035 and WD 0121-756.
This artist’s illustration depicts what Chu et al. think is happening in the binary system KPD 0005+5106. The data suggest the white dwarf (blue sphere) is blasting a companion object (brown and red object...Rastar RC Lamborghini Toy Car, 1:14 Lamborghini Aventador LP700-
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Hydrogen is the most abundant element. When a neutral hydrogen atom gets blasted with energy, its electron can be boosted to a larger orbit with a higher energy level. Then the electron can jump from one orbit level to another, which produces a photon. When the electron moves to the inner-most orbit from the orbit directly adjacent, it emits a photon with a particular wavelength in the ultraviolet...
Archaeologists from the Israel Antiquities Authority (IAA) have unearthed a Hellenistic fortified structure as well as weapons, burnt wooden beams and dozens of coins — strong evidence of a battle between the Hasmoneans and the Seleucids around 112 BCE — near Maresha, the largest Hellenistic city in the Lachish region and the capital of Idumea.
The 2,100-year-old Hellenistic fortress...
Paleontologists working in Brazil have uncovered the fossil of an ornithuromorph bird that lived during the Early Cretaceous epoch.
Life reconstruction of Kaririavis mater. Image credit: Divulgação.
Kaririavis mater lived in what is now Brazil some 115 million years ago (Early Cretaceous epoch).
“Kaririavis mater lived during the Cretaceous period, when the supercontinent Gondwana — which...
The two new frog species have been scientifically described with the help of citizen scientists and their recordings through the FrogID app.
The screaming tree frog (Litoria quiritatus), male, in Darkes Forest, New South Wales, Australia. Image credit: Jodi Rowley.
The two new species — named the slender bleating tree frog (Litoria balatus) and the screaming tree frog (Litoria quiritatus) —...
Astrophysicists from the LIGO-Virgo-KAGRA Collaboration have detected a further 35 gravitational waves since the last catalog release in October 2020, bringing to 90 the total number of observed events since gravitational-wave observations began. Of the 35 events detected, thirty two were most likely to be black hole mergers — two black holes spiraling around each other and finally joining...
A 30-year-old woman from the city of Esperanza, Argentina — the so-called Esperanza Patient — appears to be the second person whose immune system cleared the HIV-1 virus without antiretroviral therapy.
Scanning electron micrograph of an HIV-infected H9 T cell. Image credit: NIAID.
“During infection, HIV places copies of its genome into the DNA of cells, creating what is known as a viral...
A team of researchers from the University of California, Berkeley, and elsewhere has sequenced and analyzed the genomes of 88 Pacific Ocean rockfish species (genus Sebastes) — some species of which are among the longest-living vertebrates known — and unmasked the genetic drivers of longevity evolution, including immunity and DNA repair-related pathways.
The calico rockfish (Sebastes dallii)....
Calcium silicate perovskite (CaSiO3) is arguably the most geochemically important phase in the Earth’s lower mantle, because it concentrates elements that are incompatible in the upper mantle. No one has ever successfully retrieved this high-pressure compound from the lower mantle before. This is because CaSiO3-perovskite is ‘unquenchable,’ meaning that it cannot retain its structure after...
In a new randomized trial, participants who drunk caffeinated coffee for two weeks were more physically active, yet they also had an increased number of abnormal heartbeats and slept less.
Marcus et al. found that coffee consumption increases ventricular ectopy, increase physical activity, and reduces sleep duration. Image credit: Sci-News.com.
“Coffee is the most commonly consumed beverage in...