Dark matter is an invisible substance making up approximately 27% of all matter and energy of the universe. Regular or 'visible' matter builds up only 5% of the universe. According to experts, the rest of the universe building blocks are made of dark energy which is associated with acceleration of our expanding universe. Dark matter is thought to be "cold", which means it doesn't move around much and makes no interaction with light.
A stream of ordinary matter is not capable of going through our planet and out again on the other side, however, things are different from the perspective of dark matter. According to computer simulation results, Earth's gravity focuses and bends the stream of dark matter particles into a narrow, dense hair.
When particles of a dark matter stream pass through Earth’s core, they become focused at the "root" of a hair, where the particle density becomes about a billion times higher than average. The root of such a hair is located 1 million kilometer (600 000 miles) away from the surface, or twice as far as the moon. The stream particles that graze Earth's surface form the tip of the hair, about twice as far from Earth as the hair’s root. Source for info on this study, http://thewatchers.adorraeli.com/2015/11/24/earth-surrounded-by-dense-hairy-filaments-of-dark-matter/ Posted by Seneca on 24 Nov 2015
In other news, it is 100 years ago this week (25 Nov) that Albert Einstein presented his theory of relativity to the world, and one of his predictions remains elusive – that of gravitational waves. Now a team in Scotland is racing to resolve the issue using a kit prepared by a team at the University of Glasgow's Institute for Gravitational Research. It will lift off to look for these ripples in the space time fabric Einstein presented the world. The equipment will travel on the European Space Agency's LISA Pathfinder spacecraft. It will take around eight weeks to reach its operating orbit, around 1.5 million km from earth towards the sun. For the latest, see this link and stay tuned! http://www.ibtimes.co.uk/glasgow-team-hopes-catch-gravitational-waves-100-years-after-they-were-predicted-1530746
IMAGE: (A) llustration showing Earth surrounded by theoretical filaments of dark matter called "hairs." Image credit: NASA/JPL-Caltech
IMAGE (B) This artist's rendering zooms in on what dark matter "hairs" might look like around Earth. Image credit: NASA/JPL-Caltech
IMAGE [C] GRAVITATIONAL WAVES: The Earth orbits the Sun because of the curvature of spacetime. Credit: WGBH Boston.