So for Ask Ethan this week, I am considering three different questions: 1.) Filip's above: [W]e use the same technology to communicate with MSL rover on Mars as to listen a radio in the cars - radio waves. What are the properties of radio waves that are important for communication? How come we can communicate with rover that is millions of miles far away, but sometimes when we go down the hill or around a curve, our radio looses signal. Why is that? 2.) From Ryan: I followed your advice and read Govert Shilling's (excellent) book Deep Space. Toward the end of the book he discusses current "mysteries" one of which is the nature of dark matter. he states that Modified Newtonian gravity (MOND) has been "Spectacularly successful" in describing galaxy motion. Also, the latest issue of Discover magazine has a long article on the "radical" theory of MOND and how its predictive power is excellent whereas anyone has yet to find even a trace of Dark Matter. My question is this: What is MOND? Is it a legitimate theory? If it is so successful, why do we only hear of Dark Matter and not MOND? 3.) From Cameron: I teach 8th grade science and my students have been learning about heat and temperature. As part of this we've looked at the concept of absolute zero, what it means and how it relates to the motion of atoms. My students want to know if there is a maximum temperature that can occur in nature, or is there no upper limit. If you want to vote, simply give a "1", "2", or "3" (with an explanation or not, as you like) as a comment on this article. Voting closes in ~4 hours, so go ahead and let me know what you want to see!
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