What is time, and why does it move forward? - EarthSky
Sep 19, 2021 1 min, 38 secs
So why does time always move forward?

When you look up at the universe, you’re seeing events that happened in the past – it takes light time to reach us.

If the universe had an infinite past and was infinite in extent, the night sky would be completely bright – filled with the light from an infinite number of stars in a cosmos that had always existed.

This means that it must have originated from a more compact state that we call the Big Bang, implying that time does have a beginning.

In fact, if we look for light that is old enough, we can even see the relic radiation from Big Bang – the cosmic microwave background.

It turns out that because the universe is on average the same everywhere, and on average looks the same in every direction, there does exist a cosmic time.

Cosmologists have used this to determine the age of the universe: its cosmic age.

Over time they would naturally seek to fill the entire box (a disordered state) – and to put the particles back into an ordered state would require energy.

It’s the same with the universe: as it evolves, the overall entropy increases.

And while it may seem like the universe is becoming more ordered rather than less – going from a wild sea of relatively uniformly spread out hot gas in its early stages to stars, planets, humans and articles about time – it’s nevertheless possible that it is increasing in disorder.

The rate of this expansion may eventually tear the universe apart, forcing it to end in a Big Rip; alternatively, dark energy may decay, reversing the Big Bang and ending the universe in a Big Crunch; or the universe may simply expand forever?

Some have argued that dark energy could cause such “quantum fluctuations” giving rise to a new Big Bang, ending our time line and starting a new one.

Bottom line: What is time, and why does it move forward.

1. COVID-19: New York State Senator Has Breakthrough Infection Of Virus - Rye Daily Voice
Oct 23, 2021 # health 30 secs
2. Biden doesn't think people need to work to get child tax credit - Business Insider
Oct 22, 2021 # politics 2 secs
3. E.coli outbreak reported in west Kentucky, source unknown - WPSD Local 6
Oct 17, 2021 # health 20 secs
4. xQc defends Twitch streamers not supporting Valkyrae over RFLCT drama - Dexerto
Oct 24, 2021 # technology 57 secs
5. Tech tip: Get more life out of your dying phone battery - Fox News
Oct 24, 2021 # technology 1 min, 47 secs
6. Alaska reports a record 235 virus hospitalizations and over 1,000 new COVID-19 cases - Anchorage Daily News
Oct 21, 2021 # health 51 secs
7. LLCHD reports three more COVID-19 deaths - 1011now
Oct 20, 2021 # health 56 secs
8. Nasa reveals the future of space travel in incredible sci-fi video - The Independent
Oct 20, 2021 # science 39 secs
9. What NASA says about fireball that streaked across Michigan sky - The Detroit News
Oct 21, 2021 # science 57 secs
10. Two blood pressure medications recalled over carcinogen concerns - CNET
Oct 21, 2021 # health 25 secs
11. Dress code at NYC's latest attraction Summit spares 'upskirting' blushes - New York Post
Oct 22, 2021 # entertainment 38 secs
12. Poll: McAuliffe, Youngkin tied in Virginia governor's race - Politico
Oct 20, 2021 # politics 55 secs
13. Kylie Jenner gives a behind-the-scenes look at the nursery she's building for her second child - Daily Mail
Oct 21, 2021 # entertainment 1 min, 15 secs
14. Blake Lively blasts 'disturbing' Instagram post of her and Ryan Reynolds' kids - Page Six
Oct 21, 2021 # entertainment 42 secs
15. Five things not to do before bedtime to promote a better night's rest - Yahoo News
Oct 18, 2021 # health 24 secs
16. Earth may be trapped inside a giant magnetic tunnel - Livescience.com
Oct 22, 2021 # politics 1 min, 54 secs


Get monthly updates and free resources.


© Copyright 2021 365NEWSX - All RIGHTS RESERVED