These are organized by a classification scheme developed exclusively for Cosma. More…
gravity : (1) : the gravitational attraction of the mass of the earth, the moon, or a planet for bodies at or near its surface (2) : a fundamental physical force that is responsible for interactions which occur because of mass between particles, between aggregations of matter (such as stars and planets), and between particles (such as photons) and aggregations of matter, that is 10-39 times the strength of the strong force, and that extends over infinite distances but is dominant over macroscopic distances especially between aggregations of matter — called also gravitation, gravitational force — Webster
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light —are brought toward (or gravitate toward) one another. On Earth, gravity gives weight to physical objects, and the Moon’s gravity causes the ocean tides. The gravitational attraction of the original gaseous matter present in the Universe caused it to begin coalescing, forming stars – and for the stars to group together into galaxies – so gravity is responsible for many of the large scale structures in the Universe. Gravity has an infinite range, although its effects become increasingly weaker on farther objects. — Wikipedia
Cambridge Digital Library Starts Off by Posting Newton’s Papers (Jennifer Howard, Chronicle of Higher Education)
Papers of Sir Isaac Newton (Cambridge University Library)
The Newton Project:Newton’s Writings as He Wrote Them (The Newton Project)
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Image: Hubble's galaxies with knots, bursts
on September 24, 2018 at 1:30 pm
In the northern constellation of Coma Berenices (Berenice's Hair) lies the impressive Coma Cluster— a structure of over a thousand galaxies bound together by gravity. Many of these galaxies are elliptical types, as is the brighter of the two galaxies dominating this image: NGC 4860 (center). However, the outskirts of the cluster also host younger spiral galaxies that proudly display their swirling arms. Again, this image shows a wonderful example of such a galaxy in the shape of […]
Japan space robots start asteroid survey
on September 22, 2018 at 6:24 pm
A pair of robot rovers have landed on an asteroid and begun a survey, Japan's space agency said Saturday, as it conducts a mission aiming to shed light on the origins of the solar system. […]
Japan space probe drops hopping rovers towards...
on September 21, 2018 at 10:15 am
A Japanese space probe Friday released a pair of exploring rovers towards an egg-shaped asteroid to collect mineral samples that may shed light on the origin of the solar system. […]
NASA balloon mission captures electric blue clouds
on September 20, 2018 at 6:44 pm
On the cusp of our atmosphere live a thin group of seasonal electric blue clouds. Forming 50 miles above the poles in summer, these clouds are known as noctilucent clouds or polar mesospheric clouds—PMCs. A recent NASA long-duration balloon mission observed these clouds over the course of five days at their home in the mesosphere. The resulting photos, which scientists have just begun to analyze, will help us better understand turbulence in the atmosphere, as well as in oceans, lakes and […]
The Dambusters raid took place 75 years ago...
on September 20, 2018 at 2:39 pm
Sir Barnes Wallis was a genius engineer who designed a very special bomb during World War II. The idea was that it would bounce across water and destroy German dams along the Ruhr Valley, causing massive flooding and damage to water and hydroelectricity supplies. […]