If the universe is an hypertorus, is it possible that we receive the light from a star twice ? |
- If the universe is an hypertorus, is it possible that we receive the light from a star twice ?
- Could CRISPR eventually allow us to borrow genes for limb regrowth from things like lizards?
- How does Newton's Law of Gravity help us predict the orbits of the planets with "great accuracy"? (Please read description.)
- Is there a relation between how tree branches/roots grow and how our own bodies creates its cardiovascular system?
- What do we currently know about possible safety factors used for the construction of ancient structures as well as the margins for material failure ancient civilizations may have been aware of?
- Does the sun experience tides?
- Why a spacecraft reentry has to be so violent? Why don't they make reentries at slower speeds to avoid all the heating up and stuff?
- What is the current State of the art in human imaging
- How much worse could The Chernobyl Disaster have been?
- What is the observed frequency-size distribution of Bolide impacts, and can this be extrapolated to predict the frequency of Tunguska-like events?
- Why are patients with concussions told not to sleep, or not to sleep for long periods?
- Are there any formulas for predicting properties of alloys?
- How is a bank account pincode not easily hackable when the small authenticator we use for online payments can verify my pincode without needing any sort of connection to a server or other online service?
- Why does it take so long for radioactive material to decay?
- To what extent do molecules of similar shape share the same properties?
- With scientists recently discovering the 400yr lifespan of the modern Greenland shark, are there any new insights into its prehistoric counterparts?
- How do peas know where to climb?
- [neuroscience] What is the brain doing when a person is in a coma?
- Can a meteorite be struck by lightening?
- Will there ever be a cure for Alzheimer's? If so, how long away is it?
| If the universe is an hypertorus, is it possible that we receive the light from a star twice ? Posted: 12 Aug 2016 06:22 AM PDT I recently read an article in a French science magazine stating that the universe might be an hypertorus (Euclidian, finite and borderless). They represented it using a cube in which when you exit through one side you actually come back in from the opposite one. I made a drawing to make my question clearer : Drawing The three panels on the left represent the universe in 2D and when you move through a side you come back through the opposite one. The star is any star and the black dot represents the Earth. The arrow is the light emited from the star. The three right panels represent what we see from the surface of the Earth.
To recap It sounds crazy but would it be possible that we see the same star at different moments of it's life span ? [link] [comments]  |
| Could CRISPR eventually allow us to borrow genes for limb regrowth from things like lizards? Posted: 11 Aug 2016 07:07 PM PDT |
| Posted: 12 Aug 2016 03:29 AM PDT I'm reading A Brief History of Time by Stephen Hawking. On pg. 17, there is a paragraph that reads:
"Newton's law of gravity also tells us that the farther apart the bodies, the smaller the force. Newton's law of gravity says that the gravitational attraction of a star is exactly one quarter that of a similar star at half the distance. This law predicts the orbits of the earth, the moon, and the planets with great accuracy. If the law were that the gravitational attraction of a star went down faster with distance, the orbits of the planets would not be elliptical, they would spiral in to the sun. If it went down slower, the gravitational forces from the distant stars would dominate over that from the earth."
What does the part in bold mean exactly? (As is clear, I'm a layperson, so please keep it simple.) Thank you! [link] [comments]  |
| Posted: 12 Aug 2016 05:39 AM PDT |
| Posted: 11 Aug 2016 07:10 PM PDT For example, did they have a kind of crude knowledge of Poisson's ratio or Hooke's Law even without calculus? Was it literally just trial and error? It seems plausible that they would have had some knowledge of material science since civil engineering is the oldest form of engineering in the world. [link] [comments]  |
| Does the sun experience tides? Posted: 11 Aug 2016 06:32 PM PDT Does the sun experience forces of gravity from its orbiting planets significant enough to have measurable or theoretical fluctuations in matter height? If so, is there an accepted value for tidal height? [link] [comments]  |
| Posted: 11 Aug 2016 10:26 PM PDT |
| What is the current State of the art in human imaging Posted: 11 Aug 2016 07:58 PM PDT I was wondering what imaging techniques (or combination of imaging techniques) are currently pushing the envelope when it comes to imaging the human body in vivo with high resolution and signal sensitivity. [link] [comments]  |
| How much worse could The Chernobyl Disaster have been? Posted: 11 Aug 2016 02:19 PM PDT |
| Posted: 11 Aug 2016 06:19 PM PDT |
| Why are patients with concussions told not to sleep, or not to sleep for long periods? Posted: 11 Aug 2016 11:50 AM PDT |
| Are there any formulas for predicting properties of alloys? Posted: 11 Aug 2016 06:55 PM PDT |
| Posted: 11 Aug 2016 12:34 PM PDT I tried finding out via Google but didn't find a good way to describe the question to receive good results. The authenticator we use can recognize the pincode of any bank account of the bank in question that produced the authenticator. It doesn't seem like a sophisticated piece of hardware (being small, light and handed out for free by banks). How can it do this without the data inside being easily hackable? [link] [comments]  |
| Why does it take so long for radioactive material to decay? Posted: 11 Aug 2016 01:30 PM PDT |
| To what extent do molecules of similar shape share the same properties? Posted: 11 Aug 2016 02:44 PM PDT I was watching a documentary on drugs and they states that Adderall and methamphetamines share similar properties due to their similar molecular shape. However, in my organic chemistry class, I learned that adding a lone functional group to a molecule can alter its function entirely. Thus, to what extent do molecules of similar shape share the same properties? [link] [comments]  |
| Posted: 11 Aug 2016 08:34 PM PDT After googling & wikiing past the article a little bit, it appears there's been some speculation over time as to whether or not very large prehistoric animals relied on some kind of warm-blooded adaptation. Does the new discovery of the persistence of the Greenland shark offer any new or interesting biological comparisons to its great ancestors? It sounds like the concept of "the lifespan of dinosaurs" is still speculative in general. So a better question may be whether the Greenland shark (tissue?) can provide any insights into the mechanics of metabolism in general. Thank you! [link] [comments]  |
| How do peas know where to climb? Posted: 12 Aug 2016 12:19 AM PDT |
| [neuroscience] What is the brain doing when a person is in a coma? Posted: 11 Aug 2016 10:22 AM PDT |
| Can a meteorite be struck by lightening? Posted: 11 Aug 2016 06:02 PM PDT |
| Will there ever be a cure for Alzheimer's? If so, how long away is it? Posted: 11 Aug 2016 07:59 PM PDT Obviously no one knows, but what is the general consensus among the medical community? I'm an 18 yr old with a family history of Dementia/Alzheimer's, and I'm curious if we're likely to make any big strides towards better treatment before my possible onset. [link] [comments]  |
| You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now. | Email delivery powered by Google |
| Google Inc., 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States | |
No comments:
Post a Comment