Johannes Kepler's theories of the universe were notable for hypothesizing that the universe was created on April 27, 4977 B.C. and that the planets orbit in an elliptical pattern rather than a circular pattern. His theory superseded previous theories which postulated that planets move in circular orbits at constant speeds.Know More
Kepler based his theories on the ideas of Copernicus, who had previously proposed that the sun, rather than the Earth, was the center of the solar system. Working from this perspective, Kepler began to carefully observe the motion of the planets, particularly Mars. After obtaining a telescope from Galileo Galilei and improving its design, he realized that the orbit of Mars did not fit into a circular pattern. From this observation, he began to formulate his theory that the planets moved in ellipses rather than circles.
This theory led to his later theories of planetary motion, which stated that the speed of a planet's motion is determined by its distance from the sun. Although his theory about the origin of the universe has been discredited by modern astronomy, his laws of planetary motion have proven widely influential in the development of later scientific theories, including Isaac Newton's law of gravity.Learn more about Universe
Gravity holds the universe together by keeping the large bodies that make up the universe together. It keeps the Earth in orbit around the sun, the sun in orbit around the center of the Milky Way and the Milky Way bound to other nearby galaxies known as the Local Group.Full Answer >
Although the ultimate fate of the universe is a largely debated topic, according to the University of Tennessee, in an open universe the universe will continue to expand forever. This is due to insufficient mass to cause the expansion to stop.Full Answer >
The universe has been known to be expanding since 1929, when Edwin Hubble measured the speed at which distant galaxies appear to be receding from Earth's position in space. In the early 21st century, astronomers measured the rate of expansion and discovered that it is increasing.Full Answer >
By taking measurements of background microwave radiation, scientists have been able to establish that the average temperature of the universe is just over 2.7 degrees Kelvin. This means that the average temperature of space is just below negative 450 degrees Fahrenheit.Full Answer >