Has Earth's inner core stopped rotating? Debate rages
The rotation of the Earth's solid inner core may have recently paused and could be reversing, according to a study published in Nature Geoscience. The authors showed evidence that oscillation in the rotation of the inner core coincides with periodic changes in the Earth's surface system and that there is an interaction between different layers of the Earth.
Hubble captures unusual galaxy merger in ancient universe
The Arp-Madore catalog is a collection of particularly peculiar galaxies spread throughout the southern sky, and includes a collection of subtly interacting galaxies as well as more spectacular colliding galaxies. "Arp-Madore 417-391", which lies around 670 million light-years away in the constellation Eridanus in the southern celestial hemisphere, is one such galactic collision. The two galaxies were distorted by gravity and twisted into a colossal ring, leaving their cores nestled side by side, said NASA.
Astronomers find supermassive black holes inside dying galaxies
The Milky Way Galaxy where we live includes stars of various ages, including stars still forming. But in some other galaxies, known as elliptical galaxies, all of the stars are old and about the same age. This indicates that early in their histories elliptical galaxies had a period of prolific star formation that suddenly ended.
First image of supermassive black hole in centre of Milky Way revealed
Scientists had previously seen stars orbiting around something invisible, compact, and very massive at the centre of the Milky Way. But the image of Sagittarius A (Sgr A) which is about 27,000 light-years away from Earth, produced by a global research team called the Event Horizon Telescope (EHT) Collaboration, provides the first direct visual evidence of it.
India-born scientist elected to US National Academy of Sciences
The election to the 170-year-old Academy is recognition of his significant contributions to science by its members. Bawa, who is also an elected fellow of the Royal Society (London) and the American Philosophical Society, was elected to the US National Academy of Sciences late last night India time.
Asteroids may have brought key building blocks of DNA, RNA: Study
The discovery, made by an international team along with NASA researchers, and described in the paper published in Nature Communications, provides more evidence that chemical reactions in asteroids can make some of life's ingredients, which could have been delivered to ancient Earth by meteorite impacts or perhaps the infall of dust.
Rising infertility in women aged 25-30
The growing problem of low egg reserve is one of the most significant factors contributing to lower fertility rates in urban women. Stress, pollution, pesticide exposure, and smoking and alcohol addiction are all major causes of this condition. A recent study found that one in every two women who were unable to conceive had a low egg reserve. Previously, it was a problem that arose with increasing age; however, this has changed. Low egg reserve is a common concern among today's young girls, with women as young as 27 years old experiencing infertility as a result.
NASA's Chandra telescope finds location of medium-sized black holes
For decades, astronomers have detected smaller black holes equal in mass either to a few suns or giant black holes with mass similar to millions of suns but the missing-link of black holes in between those sizes have eluded discovery. The existence of these intermediate-sized or massive black holes has long been theorised but finding them has proven difficult as the light emitted by objects falling into them is not easy to detect.
Antidepressants not linked with happiness, improved quality of life: Study
While studies have shown the efficacy of antidepressant medications for treatment of depression disorder, these medications' effect on patients' overall well-being and health-related quality of life remains controversial. Now, researchers from King Saud University in Saudi Arabia found that antidepressants are not associated with significantly better health-related quality of life.
Sun fires strongest solar flare in nearly 5 years
According to the US Space Weather Prediction Center (SWPC), an X2.2 flare occurred at 11.57 p.m EDT on April 19. The flare erupted from a region just beyond the southwest limb of the Sun - likely former Region 2992. The strong flare was associated with multiple bursts on specific radio frequencies but did not result in coronal mass ejection (CME)."Forecasters are waiting for available coronagraph imagery from the NASA/SOHO LASCO instrument to confirm if a CME took place, and if so, analyse accordingly," SWPC said.