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A tensor is like a vector, which contains two properties. Velocity, for example, is a vector as it represents speed in a given direction.

A tensor contains more than two properties, which may be written in a matrix - numbers or symbols that are arranged in rows and columns. General relativity shows that observers in any frame will agree on how spacetime is curved by objects, and hence their gravitational field, whether they are moving relative the object or not.

This means that the curvature of space, and hence the force of gravity is invariant. Light moves through curved spacetime, taking the shortest possible path, however the shortest path across a curved surface is not necessarily a straight line.

The shortest path, which may be curved, is known as a geodesic.

This meant general relativity predicted that the path of light is bent by heavy objects, like the Sun. This assumes that the universe is homogeneous and isotropic when averaged over very large scales.

Homogeneity assumes that our observations are representational of the whole universe, and isotropy means that the universe is the same in whichever direction we look.

Eddington knew that if mass curves spacetime, then light would travel in a curved path as it approaches a massive object like the Sun.

This means that if the glare of the Sun were blocked out, like it is during an eclipse, he would be able to see stars that should be behind it.

The stars appeared to have moved from their usual relative positions because their light is bent around the gravitational well of the Sun. This has caused images of the galaxies to be enlarged and duplicated, and is known as gravitational lensing.

Eddington showed that light is deflected around the Sun in Swiss astrophysicist Fritz Zwicky first considered using galaxy clusters as gravitational lenses in These ripples are known as gravitational waves.

The neutron stars create curves in spacetime as they orbit each other, and these dissipate at the speed of light, creating waves.

We now know that supermassive black holes reside at the centre of most galaxies, including our own. These are millions of times the mass of the Sun. Einstein predicted that from the point of view of a stationary observer, light will appear to be red shifted as it moves towards a strong gravitational force.

This change corresponds to the fact that time appears to run slower for observers in a stronger gravitational field. Instead, spacetime is affected by what it contains.

The choice is arbitrary.What are KS2 SATs Papers? KS2 SATs papers (or Key Stage 2 SATs Papers) are formal exams, taken by children in Year 6. As such, plenty of people refer to them as Key Stage 2 SATs, Key Stage 2 Tests, Year 6 SATs papers or simply Year 6 SATs..

KS2 SATs are mandatory tests written by the Standards and Testing Agency (STA) as part of the Department for Education's national curriculum .

Maths Test Papers Ks3 pdf KS3 SATs Papers - SATs Papers KS3 [] - Free Downloads Sat, 17 Nov GMT KS3 Maths papers (also known as a Year 9 Maths test) are given to children at the end of Year Children take two KS3 Maths SATs papers depending on their ability.

Level for the most basic and level maths papers. 12 rows · SATs Papers All available SATs Papers. Instant & Free Download. KS3 SATs papers are now written and marked within schools About KS3 SATs Papers. KS3 SATs papers were introduced in KS3 test papers challenged children in their Year 9 Maths, Science and English.5/5().

These are the SATS papers for the tests taken in May in English and maths. Answers are found in the Mark Schemes. SATS papers for and Earlier papers will be found on the Worksheet Finder and on the Improve your child's SATS results page..

SATS Key stage 2.

KS3 SATs papers are now written and marked within schools About KS3 SATs Papers. KS3 SATs papers were introduced in KS3 test papers challenged children in their Year 9 Maths, Science and English.

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Year 7 and 8 Optional SATs | TES Community