Comments of the Week #90: from Spiral Galaxies to Quantum Gravity

“As far as extra dimensions are concerned, very tiny extra dimensions wouldn’t be perceived in everyday life, just as atoms aren’t: we see many atoms together but we don’t see atoms individually.” -Ed Witten As we approach the end of the year, Starts With A Bang looks ahead to what’s new and upcoming, rather than back on the … Read moreComments of the Week #90: from Spiral Galaxies to Quantum Gravity

Ask Ethan: When A Photon Gets Redshifted, Where Does The Energy Go? (Synopsis)

“…in every kind of chemical change no loss of matter occurs […] in all the varied modes of physical change, no loss of energy takes place.” -Sir Henry Enfield Roscoe When it comes to the physical laws of the Universe, perhaps the most unbreakable of all seems to be the law of conservation of energy. In every … Read moreAsk Ethan: When A Photon Gets Redshifted, Where Does The Energy Go? (Synopsis)

What are quantum gravity’s alternatives to string theory? (Synopsis)

“I just think too many nice things have happened in string theory for it to be all wrong. Humans do not understand it very well, but I just don’t believe there is a big cosmic conspiracy that created this incredible thing that has nothing to do with the real world.” –Edward Witten String theory is … Read moreWhat are quantum gravity’s alternatives to string theory? (Synopsis)

Gift This, Not That: Coloring the Universe vs. The Hubble Cosmos (Synopsis)

“The time will come when diligent research over long periods will bring to light things which now lie hidden. A single lifetime, even though entirely devoted to the sky, would not be enough for the investigation of so vast a subject… And so this knowledge will be unfolded only through long successive ages. There will … Read moreGift This, Not That: Coloring the Universe vs. The Hubble Cosmos (Synopsis)

Comments of the Week #89: from black hole evaporation to scientific theories

“”There is a fundamental difference between religion, which is based on authority, [and] science, which is based on observation and reason. Science will win, because it works.”” -Stephen Hawking Every week on Starts With A Bang brings with it a new set of considerations about the Universe we all inhabit. It was awfully busy here, with two … Read moreComments of the Week #89: from black hole evaporation to scientific theories

Ask Ethan: Why Aren’t Spiral Galaxies More Wound Up? (Synopsis)

“The farther we peer into space, the more we realize that the nature of the universe cannot be understood fully by inspecting spiral galaxies or watching distant supernovas. It lies deeper.” -Robert Lanza When you take a look at a spiral galaxy in the night sky, it seems obvious that the stars on the inner … Read moreAsk Ethan: Why Aren’t Spiral Galaxies More Wound Up? (Synopsis)