Astrnomy Definition and 13 Threads

Hello everyone, My name is Dani Rose. I recently joined because I am working on a series of essays about geology, continental drift, and astronomy. Through my research, I realized how important it is for scientists from different fields to work together. I believe this community is a wonderful...

My hypothesis: The number of red giants is equal to the number of stars times the given fraction f. The number of stars in a solid angle omega, is given by the density distribution of stars in the Galaxy times the volume of the observed solid angle: #RG = f*n(r)*V where V = (d^3*omega)/3. I...

tldr summary

Hello all! I have been taking an academic break from school for certain mental health reasons that I won't waste your time talking about. Now, I am only a freshman in college. My school's physics department currently offers 2 majors: Physics and Physics/Astronomy. Obviously, I have lots of time...

Hello, I am trying to solve this question: Assume that the Sun's energy production doesn't happen by fusion processes, but is caused by a slow compression and that the radiated energy can be described by the Virial Theorem: $$L_G = - \frac{1}{2} \frac{GM^2}{R^2} \frac{dR}{dt} $$ How much must...

The Hubble Telescope helped us to see how enormous the universe really is. We now know from data built up from that that the universe likely has 2 trillion galaxies in it. Now when James Webb gets out their and starts taking better pictures; I’m afraid the count of galaxies will jump to 10 or...

How did you find PF?: Via a website link I want to know difference of the words in English

Homework Statement: Ideas for astrophysics EE Homework Equations: Extended essay Hi Guys! I'm trying to figure out a research topic in astrophysics/astronomy for my IB extended essay. I don't really know what to do, do any of you any ideas, maybe even off the top of your heads? It needs to...

Homework Statement A star moves away from us at a speed of 10 km / s. the angle between the speed direction and the line of sight are 30 °. What is the observed wavelength of the Hα line? Then we suppose the observer is also moving at a speed of 20 km / away from the star. What is the observed...

New observations of Compact Elliptical Galaxy Mrk 1216 show a very high apparently dark matter fraction based upon the intragalaxy dynamics of stars in the galaxy, relative to the baryonic mass of the galaxy inferred from typical mass to light ratios for galaxies of that type. The inferred...

Homework Statement Suppose you wanted to be able to see astronauts on the moon. What is the smallest diameter of the objective lens required to resolve a 0.60 m object on the moon? Assme the wavelength of the light is near the middle of the visible spectrum: 550 nm yellow light. (in m) A...

Hello all, I am going to college this fall and I will be studying physics with a concentration on astrophysics, I am a pretty good student and afterwards I will serve 5 years in the Navy as an officer. My question is, will the 5 years I spend in the Navy hinder my chances of getting into top...

According to Source: They discover a mega cluster of 14 galaxies that originated only 1400 years after the Big Bang This is the most active place in this universe