Category Archives: Physics

What Equipment Does One Need to Send a Radio Signal to a Distant Star?

Question: Hi. I’m doing some research for a piece of fiction and was wondering: if you had a radio transmitter/receiver aimed at a far star 1) what kind of equipment would one need and 2) how would the equipment’s behaviour … Continue reading

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What Causes the Earth’s Magnetic Field?

Question: Earth acts like a magnetic field that we all know. But firstly, the question which comes in our mind is what is the source of this magnetic field. After reading various articles and from sites about this, I got … Continue reading

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Do Radio Sources “Twinkle”?

Question: Usually observations with radio telescopes are not affected by rain, clouds etc. but recently i heard scintillation effects can affect observations with radio telescopes. I want to know why it is affected by that. – Anjali Answer: Radio observations … Continue reading

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What if the Sun did not turn into a Red Giant and the Moon moved out of its Orbit Around the Earth?

Question: What effects would we see on Earth if the Sun wouldn’t turn into a Red Giant? If the Moon would move away slowly until extracted from its orbit, would that, for example, affect Earth’s axis?  – Walle Answer: If … Continue reading

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Equation for Orbits?

Question: Why does the following equation seem to predict stable orbits around the sun as well as for moons around planets without any involvement of balancing centripetal and gravitational forces. The following is the equation that in my investigation seems … Continue reading

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Do Gravitational Waves Need a Medium to Travel Through?

Question: Do gravitational waves need a medium to travel. Do they slow down when passing through a medium?  – Michael Answer: Gravitational waves are best described as distortions in the fabric of space that are due to objects with mass.  … Continue reading

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The Light-Year-Long See-Saw Conundrum

Question: A lunch friend and I are debating this question. Essentially, consider a see-saw, a board or rod with a fulcrum in the middle.  This rod is made of unbendable, nondestroyable fictional material.  It will not bend. Make this rod … Continue reading

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Identifying Strange Sounds Received by a Radio

Question: I received a radio wave with my homemade antenna that it sounds like a motorbike, like a Harley Davidson. Which type of signal it could be? it could be about the sun or the earth magnetosphere? It’s for a … Continue reading

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Are We Seeing Stars as They Were in the Past?

Question: If we can see the light coming from stars billion years away, and if some of these stars don’t even exist anymore, does this mean we are literally starting at the past?  – James Answer: Yes.  Since all of … Continue reading

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Why isn’t the Precession of the Lunar Nodes Uniform with Time?

Question: I am an amateur naked eye astronomer.  I teach astronomy to 6th graders, I read a lot on the subject, and I do a lot of experiments and observations to better understand the movements of the sun, moon, etc. … Continue reading

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