Consumer & Gadgets

Supernumerary virtual robotic arms can feel like part of the body

Research teams at the University of Tokyo, Keio University and Toyohashi University of Technology in Japan have developed a virtual robotic limb system which can be operated by users' feet in a virtual environment as extra, ...

Hi Tech & Innovation

Creating a drag-friendly garment that changes in real time

Sarah Aguasvivas Manzano and her team's latest work has real-world, practical use. Wearable technology is being explored in the space industry for astronauts and big tech companies are eager for improvements to the inter-connected ...

Internet

Researcher creates free comment moderation software for YouTube

As an expert in building a safer and fairer internet, Rutgers Assistant Professor Shagun Jhaver long suspected that digital content creators from minority groups suffered disproportionate online harassment. But when he heard ...

Electronics & Semiconductors

Scientists decide how to prove out perovskite panels for space power

Perovskites, which have shown enormous potential as a new semiconductor for solar cells, are gaining attention as well as a potential next-generation technology to also power spacefaring missions. As scientists around the ...

Engineering

Portable generator powers small safety devices

A new stick-like, water-based device can convert energy from movement into electricity. The technology, which was reported in the journal Science and Technology of Advanced Materials, could be used to power portable devices, ...

Engineering

Using 3D printing for alloy materials innovation

While millions of people around the world enjoy renewed mobility from hip and knee replacements, many don't realize that the materials used in such implants have basically stayed the same since the 1960s.

page 3 from 24

Space

Space is the boundless, three-dimensional extent in which objects and events occur and have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of the boundless four-dimensional continuum known as spacetime. In mathematics spaces with different numbers of dimensions and with different underlying structures can be examined. The concept of space is considered to be of fundamental importance to an understanding of the universe although disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework.

Many of the philosophical questions arose in the 17th century, during the early development of classical mechanics. In Isaac Newton's view, space was absolute - in the sense that it existed permanently and independently of whether there were any matter in the space. Other natural philosophers, notably Gottfried Leibniz, thought instead that space was a collection of relations between objects, given by their distance and direction from one another. In the 18th century, Immanuel Kant described space and time as elements of a systematic framework which humans use to structure their experience.

In the 19th and 20th centuries mathematicians began to examine non-Euclidean geometries, in which space can be said to be curved, rather than flat. According to Albert Einstein's theory of general relativity, space around gravitational fields deviates from Euclidean space. Experimental tests of general relativity have confirmed that non-Euclidean space provides a better model for explaining the existing laws of mechanics and optics.

This text uses material from Wikipedia, licensed under CC BY-SA