Our Galaxy and the Universe
... • the galaxy we live in is called the Milky Way. It is 100,000 LY across and contains about 300 billion stars. ...
... • the galaxy we live in is called the Milky Way. It is 100,000 LY across and contains about 300 billion stars. ...
The Big Bang Theory - Red Hook Central Schools
... • The speed of light is a universal constant of 300,000 km/s2 • We observe stars millions/billions of light-years away • A light-year is the distance that light travels in 1 year – the light we see today from a star 500 light years away is 500 years old • The furthest stars away are 10-15 billion li ...
... • The speed of light is a universal constant of 300,000 km/s2 • We observe stars millions/billions of light-years away • A light-year is the distance that light travels in 1 year – the light we see today from a star 500 light years away is 500 years old • The furthest stars away are 10-15 billion li ...
ASTRONOMY 2 — Overview of the Universe Fourth Practice
... and Weak Nuclear Force. T (11) Our Galaxy’s measured rotation velocity indicates that it contains a lot of dark matter. T (12) The discovery of the Cosmic Microwave Background Radiation caused astronomers to propose the Big Bang theory. F ...
... and Weak Nuclear Force. T (11) Our Galaxy’s measured rotation velocity indicates that it contains a lot of dark matter. T (12) The discovery of the Cosmic Microwave Background Radiation caused astronomers to propose the Big Bang theory. F ...
13800000000 Years Ago The First Sky
... Size of our Universe = 13800000000 Light Years = 100000000000000000000000 kilo-meters !!! ...
... Size of our Universe = 13800000000 Light Years = 100000000000000000000000 kilo-meters !!! ...
Earth - Capital High School
... The Hubble Ultra Deep Field, or HUDF, is an image of a small region of space in the constellation Fornax, composited from Hubble Space Telescope data accumulated over a period from September 3, 2003 through January 16, 2004. It is the deepest image of the universe ever taken in visible light, lookin ...
... The Hubble Ultra Deep Field, or HUDF, is an image of a small region of space in the constellation Fornax, composited from Hubble Space Telescope data accumulated over a period from September 3, 2003 through January 16, 2004. It is the deepest image of the universe ever taken in visible light, lookin ...
Astronomical Unit (AU)
... us to refine our model, but there is no crisis in our understanding (yet). • Science is an ongoing process - forcing us to test our model through prediction and observation. The more tests it passes, the greater is our confidence in it. ...
... us to refine our model, but there is no crisis in our understanding (yet). • Science is an ongoing process - forcing us to test our model through prediction and observation. The more tests it passes, the greater is our confidence in it. ...
Physical cosmology
Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate. For most of human history, it was a branch of metaphysics and religion. Cosmology as a science originated with the Copernican principle, which implies that celestial bodies obey identical physical laws to those on Earth, and Newtonian mechanics, which first allowed us to understand those physical laws.Physical cosmology, as it is now understood, began with the development in 1915 of Albert Einstein's general theory of relativity, followed by major observational discoveries in the 1920s: first, Edwin Hubble discovered that the universe contains a huge number of external galaxies beyond our own Milky Way; then, work by Vesto Slipher and others showed that the universe is expanding. These advances made it possible to speculate about the origin of the universe, and allowed the establishment of the Big Bang Theory, by Georges Lemaitre, as the leading cosmological model. A few researchers still advocate a handful of alternative cosmologies; however, most cosmologists agree that the Big Bang theory explains the observations better.Dramatic advances in observational cosmology since the 1990s, including the cosmic microwave background, distant supernovae and galaxy redshift surveys, have led to the development of a standard model of cosmology. This model requires the universe to contain large amounts of dark matter and dark energy whose nature is currently not well understood, but the model gives detailed predictions that are in excellent agreement with many diverse observations.Cosmology draws heavily on the work of many disparate areas of research in theoretical and applied physics. Areas relevant to cosmology include particle physics experiments and theory, theoretical and observational astrophysics, general relativity, quantum mechanics, and plasma physics.