Time

1) About how long ago did the big bang take place? 13.7 billion years ago. 2) What is a black hole? Black holes are areas of intense gravitational pressure. 3) Does the universe continue to expand? It continues to expand and cool to this day and we are inside of it 4) Was there really a big bang? Experts say that there was no explosion; there was (and continues to be) an expansion. 5) What light elements seem to support the Big Bang Theory?
 * __Big Bang Theory__**
 * First of all, we are reasonably certain that the universe had a beginning.
 * Second, galaxies appear to be moving away from us at speeds proportional to their distance. This is called "Hubble's Law," named after Edwin Hubble (1889-1953) who discovered this phenomenon in 1929. This observation supports the expansion of the universe and suggests that the universe was once compacted.
 * Third, if the universe was initially very, very hot as the Big Bang suggests, we should be able to find some remnant of this heat. In 1965, Radioastronomers Arno Penzias and Robert Wilson discovered a 2.725 degree Kelvin (-454.765 degree Fahrenheit, -270.425 degree Celsius) Cosmic Microwave Background radiation (CMB) which pervades the observable universe. This is thought to be the remnant which scientists were looking for. Penzias and Wilson shared in the 1978 Nobel Prize for Physics for their discovery.
 * Finally, the abundance of the "light elements" Hydrogen and Helium found in the observable universe are thought to support the Big Bang model of origins.

**__ Time Keeps On Slippin’ __**
1) **What is the current calendar most of the world uses / accepts? Explain who made it and why this is accepted.** **The Gregorian** calendar is the internationally accepted civil calendar. It was introduced by Pope Gregory ﻿  XIII,    2) What is a leap year? Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100. 3) List three other types of calendars used and how they set up their calendar (ex. Lunar). The lunar calendar is the arrangement to be used for a given century is communicated, anyone in possession of the tables can find the age of the moon on any date, and calculate the date of Easter.   4) What is BC? Before Christ 5) What is BCE? Before Common Era  6) What is AD?  Anno Domini 7) What is CE? Common Era  8) What is MYA? Million Years Ago 9) According to the timeline site how many periods of when are there and list time.   Big Bang Theory- 14000 MYA    Formation Of Earth- 4600 MYA    Cambrian: Explosion of Life on Earth- 543 MYA- 490 MYA    Permain: Largest Mass Extinction- 290-248 MYA    Mesozoic: Age of Dinosaurs- 245-65 MYA    Stone Age: The Human Era 5 MYA- 2500 BC    Ice Age: Extinction of Large Mammals- 70000 BC- 8000 BC    Neolithic: First Permanent Settlements 9000-4500 BC    Bronze Age: First Pharaohs 3200-1200 BC    Iron Age: Start of the Trojan War- 1200-322 BC    Hellenistic Period- 332-63 BC    Roman Period- 63 BC- 476    Byzantine Period- 330-1453    Middle Ages- 476-1350    Renaissance- 1350-1600    Reformation- 1500-1600    Enlightenment- 1600-1800    Industrial Revolution- 1750-1900    20th Century- 1900-2000    21st Century- 2000-2099    Future- 2009 11) List three ancient calendars. Stonehenge, Aztec, Stars. 12) List two ancient clocks and how they worked. Egyptian shadow clock is used by when the sun moves the shadow determines the time. Early water clock is used by stone vessels with sloping sides that allow water to drip at a nearly constant rate from a small hole near the bottom.  13) What was a revolution of timekeeping? Accurate mechanical clocks. 14) What allows for standard more accurate clocks? Aztec clocks. 15) What are time zones? The different times of places in the world. 16) What is the prime meridian? The zero meridian (0°), used as a reference line from which longitude east and west is measured.  17) If it’s 10:00 AM in Regina, what time is it in Toronto? 12 PM London? 5 PM Moscow? 8 PM Tokyo? 1AM Hawaii? 6 AM 18) What is Daylight Saving Time? Time during which clocks are set one hour or more ahead of standard time to provide more daylight at the end of the working day during late spring, summer, and early fall.  Do we use this in Saskatchewan? No. 19) Is there a year zero? No. 20) Are we starting a new decade in 2010 or 2011? 2010 21) What is linear time? A time base that makes the electron beam of a cathode-ray tube move at a constant speed along the horizontal time scale. 22) What is cyclical time?   Of or pertaining to a cycle or circle; moving in cycles.   = =  __ Part 1- Q & A __

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1) What happened at 12 AM January 1, 2004? Earth formed from planetary nebula 2) What happened at 4:41 PM February, 25 2004? Inferred origin of life (first cells) ======

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3) How long of actual time happened between the event in question one and two? 700 million years. 4) What happen at 3:39 PM September 3, 2004? Oldest age-dated rocks on Earth 5) What happened at 7:40 PM November 21, 2004? Ordovician system begins 6) What happened at 1:27PM December 2, 2004? First sharks 7) What happened at 12:09 PM December 12, 2004? Triassic system begins 8) What happened at 8:37 PM December 13, 2004? First dinosaurs (Eoraptor and Saltoposuchus) 9) What happened at 7:52 PM December 26, 2004? End of Mesozoic, probably meteor or comet impact 10) What happened at 5:18 PM December 31, 2004? Oldest human like ancestors (hominids) 11) What happened at 11:48 PM December 31, 2004? First modern man, Homo sapiens 12) What happened at 12:00 AM January 1, 2005? World War II 13) How long of actual time happened between the event in question 11 and 12? 62 years. ======

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15) On the chart how many years are represented by one second. 1 billion. ======