The video accessible by clicking the link posted below is only available whenever the station establishes a ground communication link, and with the station orbits the Earth once every ninety minutes viewers will encounter a sunset or sunrise just about every forty-five minute period. The live stream often consists of selective audio conversations between Mission Control and the team. The International Space Station via UStream Networks allows viewers to watch a live video stream from a number of cameras mounted on the side of the space station featuring a spectacular view of the Earth as well as certain activities performed by the crew on-duty. ▪ Theoretical astronomy includes stellar dynamics and evolution, the formation and evolution of galaxies, the study of large scale matter within the universe, astroparticle physics and a variety of other topics. ▪ Observational astronomy is known for including radio astronomy, infrared astronomy, optical astronomy, ultraviolet, x-ray, gamma-ray, fiends not based on the known electromagnetic spectrum and celestial mechanics. ![]() ▪ Professional astronomy by the 20th century was divided into both a theoretical and an observational branch whereas observational astronomy is referred to as primarily focusing on the acquisition of data taken from astronomically studied objects, while theoretical astronomy is noted for the development of analytical models to detail celestial objects and unexplained phenomena. ▪ Christiaan Huygens assisted by his brother after a long and excessive effort created the first powerful telescopes made from Keplerian construction which was used in 1655 to discover the planet Saturn’s brightest satellite the moon Titan. This speculative incorrect theory later became known as the geocentric model which suggested that the Earth and not the Sun was the center of the Universe. It was through these observations that theories based on the nature of the sun and the planets were formed. This included charting the positions of known planets and stars in a science which is not known today as astrometry. ![]() ▪ With the development of civilization primarily in Greece, China, Egypt Central America and Mesopotamia a number of centers dedicate to astronomy were founded aimed at determining the nature and evolution of the universe. ▪ It was the Italian mathematician, physicist, philosopher, engineer, and astronomer Galileo Galilei who paved the way for the astronomy in 1610 when he discovered the moons of Jupiter, the hills and valleys on the moon, the phases of the planet Venus and later the spots on the Sun. ▪ Prior to the invention of the telescope early astronomers studied the stars by standing on a tall building offering a good view. ▪ In early history astronomy was thought to consist of predictions and observations of objects only visible to the naked eyes via a number of sites such as the prehistoric monument in Wiltshire, England known as Stonehenge. Today there are a variety of telescopes used in astronomy many of which are land based while others such as the Hubble Space Telescope are operated in space.
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