For more than 25 years, our understanding of terrestrial space weather has been partly based on incorrect assumptions about how nitrogen, the most abundant gas in our atmosphere, reacts when it collides with electrons produced by energetic ultraviolet sunlight and "solar wind."

New research published today, Tuesday 8 June, in IOP Publishing's Journal of Physics B: Atomic, Molecular and Optical Physics describes how scientists from NASA's Jet Propulsion Laboratory (JPL) at the California Institute of Technology have fired electrons of differing energies through a cloud of nitrogen gas to measure the ultraviolet light emitted by this collision.

The Earth and Moon were created as the result of a giant collision between two planets the size of Mars and Venus. Until now it was thought to have happened when the solar system was 30 million years old or approx. 4,537 million years ago. But new research from the Niels Bohr Institute shows that the Earth and Moon must have formed much later - perhaps up to 150 million years after the formation of the solar system. The research results have been published in the scientific journal, Earth and Planetary Science Letters.

"We have determined the ages of the Earth and the Moon using tungsten isotopes, which can reveal whether the iron cores and their stone surfaces have been mixed together during the collision", explains Tais W. Dahl, who did the research as his thesis project in geophysics at the Niels Bohr Institute at the University of Copenhagen in collaboration with professor David J. Stevenson from the California Institute of Technology (Caltech).

A colossus of an ancient Egyptian deity in Luxor, an Umayyad coin in Wadi Al-Natroun and the tomb of a 19th-Dynasty mayor of Memphis at Saqqara are the most recent discoveries in Egypt.

At the end of the winter archaeological season the announcement of new discoveries are helping specialists to decipher more chapters in Egypt's ancient history. The most recent discoveries were carried out by Egyptian missions from the Supreme Council of Antiquities (SCA) and Cairo University in Luxor, Wadi Al-Natroun and Saqqara.

A fresh comet is swinging through the inner solar system, and it is brightening rapidly as it approaches the sun. Presenting, Comet McNaught (C/2009 R1):

Michael Jäger of Stixendorf, Austria, took the picture on June 6th using an 8-inch telescope. The comet's green atmosphere is larger than the planet Jupiter, while the long willowy ion tail stretches more than a million kilometers through space. These dimensions make the comet a fine target for backyard telescopes.

Comet McNaught can be found low in the northeastern sky before dawn gliding through the constellation Perseus. It is brightening as it approaches Earth for a 1.13 AU close encounter on June 15th and 16th. Currently, the comet is at the threshold of naked eye visibility (5th to 6th magnitude) and could become as bright as the stars of the Big Dipper (2nd magnitude) before the end of the month. Estimates are uncertain, however, because this comet is a newcomer to the inner solar system, and thus somewhat unpredictable.

Earth and space are about to come into contact in a way that's new to human history. To make preparations, authorities in Washington DC are holding a meeting: The Space Weather Enterprise Forum at the National Press Club on June 8th.

Richard Fisher, head of NASA's Heliophysics Division, explains what it's all about:

"The sun is waking up from a deep slumber, and in the next few years we expect to see much higher levels of solar activity. At the same time, our technological society has developed an unprecedented sensitivity to solar storms. The intersection of these two issues is what we're getting together to discuss."

The National Academy of Sciences framed the problem two years ago in a landmark report entitled "Severe Space Weather Events - Societal and Economic Impacts." It noted how people of the 21st-century rely on high-tech systems for the basics of daily life.

Kaali, on the Estonian island of Saaremaa, is the site of the last giant meteorite impact to occur in a densely populated region. The landscape that the collision left in its aftermath has been the subject of many mythological tales and may have been home to a mysterious ancient cult.

About 7,500 years ago, a huge rock from space came hurtling toward the earth, faster than a speeding rocket. Several kilometers above the earth's surface, the meteorite broke into pieces from the pressure and heat of the atmosphere. The resulting chunks collided into Saaremaa with the force of a small nuclear bomb, wreaking havoc on the landscape and possibly claiming numerous victims.

The explosion left nine total craters, now known as the Kaali Meteorite Crater Field. Some of these craters are quite small: one measures only twelve meters across and one meter deep. But the most interesting of the group is the largest crater, a gently sloping bowl filled with stagnant, murky water.

Simply known as Kaali crater, the largest crater (which measures 110 meters across) is believed to have been a sacred site for many centuries, in part due to its cosmic origin. Surrounding Kaali crater are the remains of an immense stone wall from the Late Bronze Age, stronger than any similar structures in the region and providing clues to the crater's use by ancient peoples.

Since the dawn of civilisation, man has been asking questions such as 'who are we?' and 'where have we come from?' Until 1858 it was universal belief that man is special creation of God. In 1858, based on phenotypic transition of various organisms including plant and animal species, Charles Darwin proposed the theory of evolution and wrote a book The Origin of Species. Eight years later in 1871, he wrote a book The Descent of Man. Based on the anatomical similarities, he declared that the chimpanzee and the gorilla are our closest living relatives and predicted that the earliest ancestors of humans would turn up in Africa, where our ape kins live today.

Now it is widely accepted view that modern human diverged from a common ancestor of chimpanzee and human nearly 6-7 million years ago. Based on fossil records found in Africa, it is now believed that modern human originated from a single mother about 160,000 years ago in East Africa. East-African mega-droughts between 135 and 75 thousand years ago, when the water volume of the lake Malawi was reduced by at least 95 per cent, could have caused their migration out of Africa. The obvious question to ask is which route did they take? Our study of the tribes of Andaman and Nicobar Islands using complete mitochondrial DNA sequences, and its comparison with the mitochondrial DNA sequences of the world populations available in the database, led to the theory of southern coastal route of migration through India, against the prevailing view of northern route of migration via Middle East, Europe, south-east Asia, Australia and then to India. Our earlier study revealed that Negrito tribes of Andaman and Nicobar Islands, such as Onge, Jarawa, Great Andamanese and Sentinelese, are probably the descendants of the first man who moved out of Africa.

This raised many questions such as: (i) what is the origin of mainland tribal and caste populations?; (ii) are there any population(s) in mainland India, which are close to Andamanese?; (iii) how much affinities the Indian populations have with Andamanese?; (iv) did the Indians contribute to the early human spread?

In order to answer these questions and to explore the ancient history of India we have harnessed genomic technology.

The collapse of the Earth's magnetic field, which both guards the planet and guides many of its creatures, appears to have started in earnest about 150 years ago. The field's strength has waned 10 to 15 percent, and the deterioration has accelerated of late, increasing debate over whether it portends a reversal of the lines of magnetic force that normally envelop the Earth.

During a reversal, the main field weakens, almost vanishes, then reappears with opposite polarity. Afterward, compass needles that normally point north would point south, and during the thousands of years of transition, much in the heavens and Earth would go askew.

A reversal could knock out power grids, hurt astronauts and satellites, widen atmospheric ozone holes, send polar auroras flashing to the equator and confuse birds, fish and migratory animals that rely on the steadiness of the magnetic field as a navigation aid. But experts said the repercussions would fall short of catastrophic, despite a few proclamations of doom and sketchy evidence of past links between field reversals and species extinctions.

Although a total flip may be hundreds or thousands of years away, the rapid decline in magnetic strength is already damaging satellites.

Two potential signatures of life on Saturn's moon Titan have been found by the Cassini spacecraft. But scientists are quick to point out that non-biological chemical reactions could also be behind the observations.

Titan is much too cold to support liquid water on its surface, but some scientists have suggested that exotic life-forms could live in the lakes of liquid methane or ethane that dot the moon's surface.

In 2005, Chris McKay of NASA's Ames Research Center in Moffett Field and Heather R Smith of the International Space University in Strasbourg, France, calculated that such microbes could eke out an existence by breathing in hydrogen gas and eating the organic molecule acetylene, creating methane in the process.

Scammers are distributing apps for Windows Mobile-based smartphones that have malware hidden inside that makes calls to premium-rate numbers across the globe, racking up expensive bills unbeknownst to the phone's owner, a mobile security firm said on Friday.

The apps--3D Anti-Terrorist game, PDA Poker Art, and Codec pack for Windows Mobile 1.0--are being distributed on as many as nine popular download Web sites, including DoDownload, GearDownload, and Software112, according to John Hering, chief executive and founder of mobile security provider Lookout.