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Our Universe : Creation, Galaxies, Stars and Celestial Objects. BIG BANG THEORY. universe began with one huge exploding atom that relapsed all the energy and matter that exists today 13.8-15 Billion years ago
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Creation, Galaxies, Stars and Celestial Objects
explosion was so enormous, that all objects in the universe are still moving outward today from the initial blast!
1 light year (which is measure of distance, NOT time) is the distance light travels in a year. Light travels at a speed of 9.5x1015 m/s!!!
White dwarf will eventually stop nuclear fusion and become a black dwarf-”Dead Star”
Gravity condenses the star to shrink
(Where protostars are formed)
A star can exist anywhere from 1 Million to 30 Billion years! (depending on size)
70 mill light years away and occurred millions of years ago!
Both images are computer animations. Black Dwarfs do not give off any light to be seen.
Size: A little larger than New York City (5-10 Miles)
is extremely dense and small.
As the star decreases in size, the pressure increases so immensely that the temperature increases dramatically.
As temperature increases, so does brightness.
A Neutron Star is almost 1.5 million times brighter than our Sun!
These are computer animations- true black holes cannot be seen because light cannot reflect off them to create a shape.
descriptions of black holes are based on equations in the theory of general relativity developed by Albert Einstein in 1916.
This is an actual black hole in the center of our galaxy. The black hole cannot be seen but we can see its gravitational pull “eating” everything around it
Computer animated asteroid impact
(Every 76 years - 2062)
Asteroids and other objects come close to our planet EVERY DAY! Most of the time we never notice them, but with improving technologies we are detecting more of them, and detecting them earlier.
In fact, on Wednesday Sept. 8th, 2010 NASA telescopes spotted 2 asteroids (both around 30 feet in diameter) that came very close to Earth. One actually passed between the orbit of Earth and the Moon.
Neither would have been large enough to cause large scale damage. The majority of these asteroids would burn up while entering our atmosphere.
-This blue ring is the Oort cloud, nearly a light year away (to put it in perspective)
-Sedna is the furthest known object to orbit our sun. The IAU (International Astronomy Union) has yet to define it as a planet/dwarf planet/asteroid.