Weather moves from west to east across the U.S. due to prevailing rapid expansion caused the Universe to cool and resulted in its westerlies present continuously expanding state. Station models According to the most recent measurements and observations, the Big Bang occurred approximately 13.75 billion years ago, which Reading Pressure: is thus considered the age of the Universe. If the first digit of the three numbers is less than 5, put a 10 in front of the pressure reading. Also put a decimal point before the last digit. If the first digit of the three numbers is greater than 5, put a 9 in front of the pressure reading. Put a decimal point before the last digit. Solar Nebula Theory Example: 107 = 1010.7 mb 602 = 960.2 mb Also known as the nebular hypothesis Reading for Wind: According to the nebular hypothesis, form in massive and The tells you the direction. dense clouds of molecular hydrogen—giant molecular clouds “arrow” The more the faster the wind is blowing. “feathers”, (GMC). They are gravitationally unstable, and matter coalesces to smaller denser clumps within, which then proceed to collapse and Reading Dew Point: form stars. Temperature that the air needs to be for it to be saturated (Holding moisture.) Star formation is a complex process, which always produces a gaseous protoplanetary disk around the young star. This may give birth to planets in certain circumstances, which are not well known. Thus the formation of planetary systems is thought to be a natural result of star formation. A sun-like star usually takes around 100 million years to form. Astronomy Galaxies are 3 types: Elliptical, Irregular and Spiral Spiral are identified by its spiral arms How Scientists Believe the Universe The Milky Way is a spiral galaxy of about 200 billion stars *Note the position of the sun in the Milky Way The Big Bang Theory Distances between and galaxies are measured in light years, The Big Bang is the dominant (and highly supported) theory of the which is the distance light travels in a year, which is 5.88 trillion origin of the universe. In essence, this theory states that the miles. universe began from an initial point or singularity which has expanded over billions of years to form the universe as we now know it. Hertzsprung-Russell Diagram According to the Big Bang theory, the Universe was once in an (H-R diagram) extremely hot and dense state which expanded rapidly. This
Weather moves from west to east across the U.S. due to prevailing westerlies Station models Reading Pressure: If the first digit of the three numbers is less than 5, put a 10 in front of the pressure reading. Also put a decimal point before the last digit. If the first digit of the three numbers is greater than 5, put a 9 in front of the pressure reading. Put a decimal point before the last digit. Example: 107 = 1010.7 mb 602 = 960.2 mb Reading for Wind: The “arrow” tells you the direction. The more “feathers”, the faster the wind is blowing. Reading Dew Point: Temperature that the air needs to be for it to be saturated (Holding moisture.) Astronomy How Scientists Believe the Universe The Big Bang Theory The Big Bang is the dominant (and highly supported) theory of the origin of the universe. In essence, this theory states that the universe began from an initial point or singularity which has expanded over billions of years to form the universe as we now know it. According to the Big Bang theory, the Universe was once in an extremely hot and dense state which expanded rapidly. This rapid expansion caused the Universe to cool and resulted in its present continuously expanding state. According to the most recent measurements and observations, the Big Bang occurred approximately 13.75 billion years ago, which is thus considered the age of the Universe. Solar Nebula Theory Also known as the nebular hypothesis According to the nebular hypothesis, form in massive and dense clouds of molecular hydrogen—giant molecular clouds (GMC). They are gravitationally unstable, and matter coalesces to smaller denser clumps within, which then proceed to collapse and form stars. Star formation is a complex process, which always produces a gaseous protoplanetary disk around the young star. This may give birth to planets in certain circumstances, which are not well known. Thus the formation of planetary systems is thought to be a natural result of star formation. A sun-like star usually takes around 100 million years to form. Galaxies are 3 types: Elliptical, Irregular and Spiral Spiral are identified by its spiral arms The Milky Way is a spiral galaxy of about 200 billion stars *Note the position of the sun in the Milky Way Distances between and galaxies are measured in light years, which is the distance light travels in a year, which is 5.88 trillion miles. Hertzsprung-Russell Diagram (H-R diagram)
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