Ask Ethan: How Can We See So Far Away In Such A Young Universe? (Synopsis) [Starts With A Bang]
“They say the universe is expanding. That should help with the traffic.” -Steven Wright
Look out at a nearby object in our Universe, and you’ll find that the amount of time you look back (in years) is pretty much exactly equal to the object’s distance (in light years). But look far away, and these two numbers start to diverge. In our 13.8 billion year old Universe, in fact, we can see back up to 46 billion light years in any direction. If you think this number seems absurd, you’re not alone.
The GOODS-N field, with galaxy GN-z11 highlighted: the presently most-distant galaxy ever discovered. Image credit: NASA, ESA, P. Oesch (Yale University), G. Brammer (STScI), P. van Dokkum (Yale University), and G. Illingworth (University of California, Santa Cruz).
If the Universe were full of material everywhere and that material emitted light that was limited by c, you’d only be able to see for 13.8 billion light years. If you added in that the material could also be moving away from you at up to c, perhaps it could reach twice that: 27.6 billion light years. Yet the figure we have, 46 billion light years, only comes about because the fabric of space itself is stretching, a unique property of general relativity.
Special relativity (dotted) and general relativity (solid) predictions for distances in the expanding Universe. Definitively, only GR’s predictions match what we observe. Image credit: Wikimedia Commons user Redshiftimprove.
Source: http://scienceblogs.com/startswithabang/2016/08/06/ask-ethan-how-can-we-see-so-far-away-in-such-a-young-universe-synopsis/
Anyone can join.
Anyone can contribute.
Anyone can become informed about their world.
"United We Stand" Click Here To Create Your Personal Citizen Journalist Account Today, Be Sure To Invite Your Friends.
Please Help Support BeforeitsNews by trying our Natural Health Products below!
Order by Phone at 888-809-8385 or online at https://mitocopper.com M - F 9am to 5pm EST
Order by Phone at 866-388-7003 or online at https://www.herbanomic.com M - F 9am to 5pm EST
Order by Phone at 866-388-7003 or online at https://www.herbanomics.com M - F 9am to 5pm EST
Humic & Fulvic Trace Minerals Complex - Nature's most important supplement! Vivid Dreams again!
HNEX HydroNano EXtracellular Water - Improve immune system health and reduce inflammation.
Ultimate Clinical Potency Curcumin - Natural pain relief, reduce inflammation and so much more.
MitoCopper - Bioavailable Copper destroys pathogens and gives you more energy. (See Blood Video)
Oxy Powder - Natural Colon Cleanser! Cleans out toxic buildup with oxygen!
Nascent Iodine - Promotes detoxification, mental focus and thyroid health.
Smart Meter Cover - Reduces Smart Meter radiation by 96%! (See Video).