Dimension (mathematics and physics)
In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it. Thus a line has a dimens...
Dimension (mathematics and physics) - Wikipedia
Tomorrow’s World returns to BBC with startling warning from Stephen Hawking
Humans will need to colonise another planet within one hundred years to ensure our survival, according to Professor Stephen Hawking.
Albert Einstein Facts: 51 Things You Didn't Know About Einstein
Amazing Albert Einstein facts and things you didn't know. Here are some amazing and little-known facts about life of one of the greatest minds of our time.
The Debate Over Time's Place in the Universe
Physicists can’t agree on whether the flow of future to past is real or a mental construct.
Earth's Core Is Two-And-A-Half Years Younger Than Its Crust
We have long known that gravity makes the Earth's centre age more slowly than its surface – but the effect is much more pronounced than once thought
A Space Spider Watches Over Young Stars
A nebula known as "the Spider" glows fluorescent green in an infrared image from NASA's Spitzer Space
Searching for Far Out and Wandering Worlds
Astronomers have made great strides in discovering planets outside of our solar system, termed “exoplanets.” In fact, over the past 20 years, more than 5,000 exoplanets have been detected beyond the e...
To See Deep into Space, Start Deep Underground
Some of the most advanced tools for answering fundamental mysteries of the universe lie nearly a mile deep in bedrock — but to understand such physics, sometimes it helps to have stunning visuals.
Alien Planet May Have Kicked Its Neighbor Into the Sticks
A planet found at an extreme distance from its parent star may have been kicked out by a fellow planet, new research suggests.
10 Amazing Photos Taken By Scott Kelly On His Year In Space
Commander Scott Kelly has just returned from his 340-day mission aboard the ISS. The record breaking mission has seen Kelly and Russian cosmonaut Mikhail Kornienko spend almost a year in space, and sc...
What do Albert Camus and string theory have in common?
Physics is really a branch of existential philosophy, says Brian Greene.
NASA researchers are working on a laser propulsion system that could get to Mars in 3 days
Despite how far we've come in space exploration, one thing still holding us back from interstellar travel is our slow spacecraft. While we're able to propel particles to close to the speed of light in...
Superbright Mars Arrives This Spring
Mars will soon be incredibly big and bright in the sky, so get your telescope ready.
Ancient Babylonians Geometrically Traced The Path of Jupiter
For millenia upon millenia, humans knew that certain objects in the sky moved while other stars stood still. These are the objects we now know as planets. But precise calculations on their movements r...
Milky Way's Second Most Massive Black Hole Found?
This massive black hole candidate may be of the 'intermediate-mass' variety, possibly tying up a perplexing astrophysical puzzle.
Astronauts grow first flower in space
The zinnia, an edible flowering plant, was planted aboard the International Space Station's Veggie chamber last November to help "provide precursory information about other flowering plants that could...
Scientists prove comets can't explain alien megastructure
Three months ago, news broke that a giant "alien megastructure" could exist around a bizarre-looking star 1,500 light-years away.
Cartesian coordinate system
A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances from the point to two fixed perpen...
Cartesian coordinate system - Wikipedia
Fourth dimension
Fourth dimension may refer to:
N-dimensional space
In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it. Thus a line has a dimens...
In geometric measurements, length is the longest dimension of an object. In the International System of Quantities, length is any quantity with dimension distance. In other contexts "length" is the m...
Time is a measure in which events can be ordered from the past through the present into the future, and also the measure of durations of events and the intervals between them. Time is often referred t...
In physics, spacetime (also space–time, space time or space–time continuum) is any mathematical model that combines space and time into a single interwoven continuum. The spacetime of our universe is ...
Spacetime - Wikipedia
Theory of relativity
The theory of relativity, or simply relativity in physics, usually encompasses two theories by Albert Einstein: special relativity and general relativity.Concepts introduced by the theories of relati...
A fractal is a natural phenomenon or a mathematical set that exhibits a repeating pattern that displays at every scale. If the replication is exactly the same at every scale, it is called a self-simil...
Fractal - Wikipedia
In mathematics, a manifold is a topological space that resembles Euclidean space near each point. More precisely, each point of an n-dimensional manifold has a neighbourhood that is homeomorphic to t...
Manifold - Wikipedia
Dimension theory
In mathematics, dimension theory is a branch of general topology dealing with dimensional invariants of topological spaces.
The inductive dimension of a topological space X is either of two values...
Dimensional analysis
In engineering and science, dimensional analysis is the analysis of the relationships between different physical quantities by identifying their fundamental dimensions (such as length, mass, time, and...
Geometry (from the Ancient Greek: γεωμετρία; geo- "earth", -metron "measurement") is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the propert...
Geometry - Wikipedia
Dimension reduction
In machine learning and statistics, dimensionality reduction or dimension reduction is the process of reducing the number of random variables under consideration, and can be divided into feature selec...