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  • 0 posts edited
  • 1 helpful flag
  • 23 votes cast
Aug
25
comment Can I measure the moon's gravity?
Thanks for your insight and clear answer! I see now that I made an error about the direction of the forces. It's a bit of a pity that my whole idea about measuring the gravitational force of the moon goes down the rabbit hole, but hey, I guess that's life... ;-o
Aug
25
awarded  Scholar
Aug
25
accepted Can I measure the moon's gravity?
Aug
23
awarded  Student
Aug
23
revised Can I measure the moon's gravity?
added 3 characters in body
Aug
23
asked Can I measure the moon's gravity?
Jun
14
awarded  Citizen Patrol
May
26
awarded  Investor
May
23
comment Longest and shortest wavelength
The context of the question is astronomy. Stars don't emit EM waves in just any frequency and redshift is limited by the age of the universe. There must be a better answer than this.
May
15
comment Which is more rare: Lunar eclipse or Solar eclipse?
I think the OP means to ask which phenomenon is more frequent and why. Could you add a (link to) an explanation as to why they are equally frequent?
Apr
12
comment Equations for coordinates of solar system objects
Great answer. I'd like to mention Paul Schlyter's page too. Quite comprehensice, with good explanations and an entire library of code sniplets.
Apr
1
comment Leaving the Milky Way
+1 for a good answer but also for the "You should stay home"
Mar
23
comment What is the Northernmost Latitude of Saturn?
In addition to @WayfaringStranger's great answer and your last "how often would it reach that point?": note that whenever Saturn is positioned on the dark side of the earth, there is every night a spot (actually a line!) on earth where Saturn in straight above.
Feb
22
comment How dense would planet earth have to be to have the same gravity as Jupiter?
As by the OP's edit, I also like to suggest you leave out your reply to @RobJeffries in your answer, as it makes your answer more complicated (while not answering the OP's question and/or intent). You could leave it as a comment for future reference though.
Feb
22
comment How dense would planet earth have to be to have the same gravity as Jupiter?
The OP asks explicitly for a formula. If you add the formula for g (GM/R^2) and substitue M for rho x Volume, you can see that g is proportional to rpo, you also answer that part of the question.
Feb
20
comment Radio Astronomy and Imaging
I'm no expert, so first as a comment: note that with a radio dish you can only detect one point (pixel) at a time. If you want to create an image like the ones you mention, you need to record every pixel individually. Alonh with tracking the radio source this requires a lot of time and effort to get an image even remotely similar. My guess is that this a too big of an ambition. I think you should be happy to detect any passing radio source (star, planet, pulsar, our milkyway's black hole, ...) while holding your dish stationary.
Dec
30
comment Basic DIY Telescope
I think it will fit your purpose. Also see this more concise description. Good luck and have fun with this great project.
Dec
29
comment Basic DIY Telescope
What's unpractical about the NY metro parents scope? I think that's your best first option. Also: you really want to build a scope? The Galileo scope has a great value for money and you can spend your time observing instead of building. The design is so transparent that you learn how the design works while using it.
Nov
30
awarded  Autobiographer
Oct
5
reviewed Satisfactory Original Hubble diagram units incorrect?