Explainer: How do satellites orbit the Earth?
Take a look at the moon and it isn't hard to imagine it as a planet. A 3,476 kilometres-in-diameter ball of rock, with basalt plains and mountain ranges, whose gravitational pull produces tides here on Earth.
Companion planets can increase old worlds' chance at life
(Phys.org) —Having a companion in old age is good for people—and, it turns out, might extend the chance for life on certain Earth-sized planets in the cosmos as well.
The bend in the Appalachian mountain chain is finally explained
The 1500 mile Appalachian mountain chain runs along a nearly straight line from Alabama to Newfoundland—except for a curious bend in Pennsylvania and New York State. Researchers from the College of New ...
Tips from space give long-range warning of flood risk
Satellite monitoring of tiny changes in the gravitational field of river basins may give up to 11 months' warning of disastrous floods, a study published on Sunday said.
Researchers use new method to calculate gravitational constant
Best of Last Week – New type of planet found, workload sharing robot limbs and clues about where all the antimatter went
Researchers suggest dark matter disk in Milky Way plane could signal rash of comet strikes on Earth
Cosmologists weigh cosmic filaments and voids
(Phys.org) —Cosmologists have established that much of the stuff of the universe is made of dark matter, a mysterious, invisible substance that can't be directly detected but which exerts a gravitational ...
Darwin meets Newton: Evolution and the mass of the galaxy
If the solution to a problem does not reveal itself straight away then why not let your initial guesswork evolve? That's the approach we've taken in trying to determine the mass of our galaxy by mapping the ...
Spiral galaxy spills blood and guts
(Phys.org) —This new Hubble image shows spiral galaxy ESO 137-001, framed against a bright background as it moves through the heart of galaxy cluster Abell 3627. This cluster is violently ripping the spiral's ...
Indian Mars mission on track, makes first engine burns
India's Mars spacecraft has completed the first of a series of engine firings designed to free it from Earth's gravitational pull and propel it towards the Red Planet, scientists said Friday.
World timekeepers wrangle over scrapping leap second
Timekeeping experts failed Friday to reach a decision on scrapping the four-decade-old practice of adding extra seconds to clocks, a system opponents say causes headaches in a hi-tech, interconnected world.
Astronomers explain why disk galaxies eventually look alike
(Phys.org) —It happens to all kinds of flat, disk galaxies – whether they're big, little, isolated or crowded in a cluster. They all grow out of their irregular, clumped appearance and their older stars ...
'Trojan' asteroids in far reaches of solar system more common than previously thought
University of British Columbia astronomers have discovered the first Trojan asteroid sharing the orbit of Uranus, and believe 2011 QF99 is part of a larger-than-expected population of transient objects temporarily ...