Physical Science

Order of the National Green Tribunal regarding deterioration of Nayar river, Uttarakhand, 05/06/2025

Order of the National Green Tribunal in the matter of In Re: News Item titled "Nayar river is vanishing - a yatra reveals conservation goes beyond science and policy" appearing in ‘The Down To Earth’ dated 03.06.2025. The original application was registered suo-motu based on the news item titled "Nayar …

Panel appointed to go into GSLV launch failure

The reason behind the pressure in one of the strap-on booster motors of the GSLV flight on July 10 dropping to zero and the motor not developing enough thrust "is the point we have to go into in detail" during the failure analysis of the flight, said G. Madhavan Nair, …

Earth has a close shave with asteroid, say scientists

Apollo Asteroid 2004 XP14, a potentially hazardous one, had a close encounter with Earth. The asteroid was traveling at 11 miles per second as it made its nearest approach to the planet. 2004 XP14 is one of the 700 celestial bodies known to pose a potential threat to the planet. …

Nanoparticle safety under scanner

recalling of a nanotechnology product in Germany within a week of its launch has renewed the debate on whether nanomaterials are safe. Magic Nano

Himalayan hazard

even as official apathy towards reducing seismic hazard continues in India, a computer simulation shows that the next big earthquake in the Himalaya may kill as many as 150,000 people and injure almost twice that number. The study carried out by Max Wyss, director of the Geneva-based World Agency of …

Polar undercurrents

scientists have discovered rivers as large as the Thames flowing kilometres below the Antarctica ice shelf. The rivers were accidentally spotted by uk researchers examining data on the changes in thickness of the layer of surface ice. The chance discovery assumes significance because of global warming. Runaway melting of polar …

Isro, Nasa sign MoU for mission moon

The National Aeronautics and Space Administration (Nasa) will have two scientific instruments on India's maiden voyage to the moon. Nasa administrator Michael Griffin and his counterpart, Indian Space Research Organisation (Isro) chairman G Madhavan Nair, signed two MoUs in Bangalore for cooperation on India's Chandrayaan-1 mission. Mr Griffin is touring …

Dying comet to pass Earth on May 12

Amateur and professional astronomers around the world, who are tracking the rare and spectacular disintegration of comet 73P/Schwassmann-Wachmann 3, can observe the dying comet on May 12 when it passes the Earth. The comet will be visible to sky observers at a distance of 11.7 million kms only through a …

Freeze frame

not many people would know that ice is found in as many as a dozen forms. The difference lies in the crystalline structure and density of the ice forms and is a result of variations in temperature and atmospheric pressure. Now, a team of scientists has discovered two more forms …

Cosmic dance: Gravity tilted planets

An early gravitational dance made the giant planets tilt the way they do

Sterile surface of moon may contain clues to life on Earth

A return mission to the moon offers the best hope of understanding life on Earth and discovering whether alien life lurks in distant corners of the universe, according to a British scientist. Ian Crawford, a planetary scientist at University College London, will today call for the first crewed missions to …

Con fusion?

the claim by an India-born nuclear scientist of achieving nuclear fusion the reaction that fuels the sun in a laboratory has landed him in a controversy, with his peers reporting they could not replicate the experiment. Rusi Taleyarkhan, a professor of nuclear engineering at Purdue University, usa, shot to fame …

Shaky foundation

earthquake-resistant measures adopted by India may be founded on shaky ground as the country has failed to incorporate the latest understanding of geophysical processes, caution experts. Seismologist K N Khattri, who recently retired as head of the seismology department at the Indian Institute of Technology in Roorkee, questions the soundness …

Hubble finds planet Xena larger than Pluto

NASA's Hubble space telescope has seen distinctly the

Dead star, new planets?

Planets may form from material spewed from the explosive death of a star, US astronomers said. Using Nasa's infrared Spitzer Space Telescope, Massachusetts Institute of Technology (MIT) skygazers detected a telltale disk of what could be early planetary debris encircling a pulsar, as the remnants of a supernova are called. …

Elementary motion

scientists have caught the ultra-swift subatomic particles called protons in action. The feat, accomplished by a team of researchers from the Imperial College in the uk , opens a new window to fundamental scientific processes. The breakthrough was achieved using hydrogen and methane molecules. It will provide opportunities to scientists …

Asteroids could be source of Earths water

Ocean water, believed to have come from icy comets beyond Neptune, may have originated in asteroids found in warmer regions closer to Earth, says astronomers in Hawaii. Two astronomers at the University of Hawaii found traces of water in an asteroid-like object floating in the solar system near Jupiter. It …

Evidence of rapid expansion of the universe

Physicists have announced that they now have the defnitive evidence that shows the universe went through extremely rapid expansion in the moments after the big bang, growing from the size of a marble to a volume larger than all of observable space in less than a trillion - trillionth of …

Super-Earth discovered

A cold, heavy "super-Earth' has been found orbiting a distant star, using a method that holds promise for detecting faraway planets that closely resemble our own, astronomers said. The planet weighs 13 times as much as Earth and is orbiting a star about 9,000 lightyears away. But instead of circling …

Did aliens rain over Kerala in July 2002?

New Scientist, in its latest issue, has a cover story

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