Tuesday, 16 August 2016

Time-resolved 2-million-year-old supernova activity discovered in Earth’s microfossil record

Massive stars, which terminate their evolution in a cataclysmic explosion called a type-II supernova, are the nuclear engines of galactic nucleosynthesis. Among the elemental species known to be produced in these stars, the radioisotope 60Fe stands out: This radioisotope has no natural, terrestrial production mechanisms; thus, a detection of 60Fe atoms within terrestrial reservoirs is proof for the direct deposition of supernova material within our solar system. We report, in this work, the direct detection of live 60Fe atoms in biologically produced nanocrystals of magnetite, which we selectively extracted from two Pacific Ocean sediment cores. We find that the arrival of supernova material on Earth coincides with the lower Pleistocene boundary (2.7 Ma) and that it terminates around 1.7 Ma (details).

Sunday, 14 February 2016

Gravitational waves and The Theory of Relativity


The Theory of Relativity

Albert Einstein
Albert Einstein explained that what we perceive as the force of gravity in fact arises from the curvature of space and time.
He found that space and time were actually interwoven into a single continuum known as space-time.
As he worked out the equations for this general theory of relativity, Einstein realised that massive objects caused a distortion within this continuum.
Imagine a large body in the centre of a trampoline. The body would press down into the fabric, causing it to dimple. If a marble was then rolled around the edge, it would spiral inward toward the body, pulled in much the same way that the gravity of a planet pulls at rocks in space. 
He proposed that objects such as the sun and the Earth work in a similar way. In the presence of matter and energy they can evolve, stretch and warp, forming ridges, mountains and valleys that cause things moving through to zigzag and curve. 
Einstein determined that massive objects (like the Earth) cause a distortion in space-time which is felt as gravity.

Thursday, 28 January 2016

ChronoZoom is aimed at visualizing the history of everything

ChronoZoom is an open source community project owned by the Outercurve Foundation and dedicated to visualizing the history of everything.  ChronoZoom bridges the gap between the humanities and sciences using a notion of “Big History” to easily understand all this information. This project has been funded and supported by Microsoft Research Connections in collaboration with University California at Berkeley, Moscow State University and University of Washington Information School (iSchool), and The Center for Web and Data Science (WDS) departments.

You can browse through all of history on ChronoZoom to find data in the form of articles, images, video, sound, and other multimedia. ChronoZoom links together a wealth of information that has been curated by experts and enthusiasts to tell important stories from history. By drawing upon the latest discoveries from many different disciplines, you can visualize the temporal relationships between events, trends, and themes. Some of the disciplines that contribute information to ChronoZoom include biology, astronomy, geology, climatology, prehistory, archeology, anthropology, economics, cosmology, natural history, and population and environmental studies.

Friday, 6 November 2015

NASA | Thermonuclear Art – The Sun In Ultra-HD (4K)

It’s always shining, always ablaze with light and energy that drive weather, biology and more. In addition to keeping life alive on Earth, the sun also sends out a constant flow of particles called the solar wind, and it occasionally erupts with giant clouds of solar material, called coronal mass ejections, or explosions of X-rays called solar flares. These events can rattle our space environment out to the very edges of our solar system. In space, NASA’s Solar Dynamics Observatory, or SDO, keeps an eye on our nearest star 24/7. SDO captures images of the sun in 10 different wavelengths, each of which helps highlight a different temperature of solar material. In this video, we experience SDO images of the sun in unprecedented detail. Presented in ultra-high definition, the video presents the dance of the ultra-hot material on our life-giving star in extraordinary detail, offering an intimate view of the grand forces of the solar system.

Contents of the day

Article of the Day

This Day in History

Today's Birthday

In the News

Quote of the Day

Science video