# What year did Kepler discover the gravity theory?

He didn't. Isaac Newton formulated the theory of gravity in 1687.

### What year did Brahe and Kepler work together to defend the heliocentric theory?

Tycho Brahe was a nobleman and a difficult character, and it would have been beneath his dignity to 'work together' with Kepler, one of his employees. Most of Kepler's work was done after Brahe's death when he gained access to the figures from Brahe's detailed high-quality measurements. Kepler used the measurements and assumed the heliocentric idea - the Sun at the centre - to produce his three laws of planetary motion. Many years later Newton's…

### When did Copernicus present the theory that the earth revolves around the sun?

He published the theory of the planets' orbits in his book "De Revolutionibus" in the year he died, which was 1543. Part of the theory was that the Sun was at the centre and all the planets revolve around it. Copernicus's theory resembled the Ptolemaic theory in having circles and epicycles to explain the paths of the planets. He found that by putting the Sun at the centres the orbits were geometrically simpler than in…

### What year did Johann Kepler invent the telescope?

Johannes Kepler did not invent the telescope. The Invention of the telescope is credited to three people Hans Lippershey, and Jacob Metius. The first records appear in 1608, more than 60 years before Kepler was born. The Kepler telescope was built by Ball Aerospace & Technologies and launched by NASA in 2009. This telescope was not invented by Johannes Kepler but was merely named in his honor.

### Why is the planets orbit elliptical?

It is the result of the behaviour of the gravity force from the Sun, which varies as the inverse square of the distance (i.e. twice the distance gives one quarter as much force). That was discovered by Newton. Kepler discovered each planet moves in an ellipse with the Sun at one focus. Newton produced the law of gravity, also his laws of motion, plus differential calculus. With these mathematical theories he was able to show…

### What year did Sir Isaac Newton discover gravity?

The years 1665 and 1666. For several months at this time, Newton lived at home. Due to the plague, college study was erratic. This period was crowded with brilliant discoveries. Amongst them, the fundamental principles of his theory of gravitation, namely, that every particle of matter attracts every other particle, and he suspected that the attraction varied as the product of their masses and inversely as the square of the distance between them.

### What causes gravity?

Max Planck, who introduced his quantum theory in year 1900, used the electronic circuit model of the atom for the derivation. The hydrogen atom consists of a single electron and a single proton. Obviously, gravity is an electric phenomenon. My own investigations have shown that there is an excellent correlation between the Coulomb forces between two hydrogen atoms and the force of gravity between them. For more details you can do an internet search for…

### Did Brahe believe in the heliocentric or geocentric theory?

Tycho Brahe believed in geocentrism. Kepler tried to convince him to accept heliocentrism, but Brahe refused, saying that if it was true, then they would be able to observe a stellar parallax throughout the year. Later, it was shown that this parallax does occur, but is small enough that they didn't notice it.

### On a cosmic calendar in which the history of the universe is compressed into 1 year when did Kepler and Galileo first discover that you live on a planet in a solar system?

OK. Let's say that all times are compressed by a factor of 13 billion. Let's just go right ahead and say that. Now let's take the high point of Galileo and Kepler to be roughly 500 years ago. 500 years . . . which is 1.5778 x 1010 seconds . . . when compressed by a factor of 13 billion . . . compresses to 1.214 seconds ago.