If there was an object such as a bucket travelling through the atmosphere...
The question came to me after thinking of the pressure waves in front of a spacecraft during re-entry. Would the pressure caused by the air being compressed cause the air to liquefy and if so at what...
View ArticleWhy do galaxies “disappear?”
So, this bit of information confused me lately. Before, I figured galaxies were no longer visible by us because their luminosity decreased in an inverse square manner. However, while watching a movie I...
View ArticleI'm thinking about choosing a master's in Astrophysics or Particle physics....
I am a physics graduate and wanted to know which course among Astrophysics and Particle physics must i do? What are the topics taught in both the fields?
View ArticleHow does the inclusion of vacuum energy modify Newtonian gravity equation of...
The equation of motion (in the center of mass frame) due only to gravitational forces between two point masses is: $$frac{d^2r}{dt^2} = -frac{GM}{r^2}$$ How does the equation get modified when a...
View ArticleA question about the Fermi acceleration
In high school physics, we know that a charged particle cannot gain energy from a magnetic field. But, it seems that in the so-called Fermi acceleration, the particle is accelerated by the magnetic...
View ArticleWhat is an overview of secondary school astronomy textbooks for students who...
I teach mathematics at the secondary level. This year my students have founded an astronomy club. Most have finished two semesters of “college-level” calculus and are familiar with the derivative,...
View ArticleAny method to determine the gravitational constant $G$ from observations in...
By the observations in cosmological scale, I mean observations by astrophysicists like motions of quasars in far distance from us, relative motions of our galaxy to others, etc. I know the famous...
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scaling law of gravitational waves and consequences
With which power law of distance is decreasing the amplitude of the distortion caused by a gravitational wave ? $r^{-1}$ ? $r^{-2}$ ? something else ? -> The coalescence between 2 black holes about...
View ArticleCan black holes grow via accretion of dark matter particles?
I’m assuming that the answer to the question in the title is a resounding yes. Since Baryonic matter and dark matter interact via gravitational forces. If this is the case how is information not lost...
View ArticleWhy are pulsar's radiation beams collimated?
Every picture of a pulsar a see shows a very collimated radiation beam. What is the mechanism generating such a collimation? Note: I am not talking about “relativistic jets”. I am talking about...
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