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1500 questions
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How Are Radioactive Decay Rates Influenced by Neutrinos - On Earth and Other Dense Planets
I read a science report recently that mentioned an accidental discovery where radioactive decay rates shifted slightly slower in advance ( about a day and a half) of solar storms or in sync with sun's 33-day pattern/rotation of the sun's core. Seems…
Cymatical
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Do Roche limits apply to black holes?
Consider black hole A, a super massive black hole at the center of the galaxy. Orbiting it is black hole B, a much less massive black hole.
If some passing body were to modify black hole B's orbit such that it fell within the Roche limit of black…
Sidney
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13
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Is the Milky Way Visible from Nebraska?
Is the Milky Way Visible from Nebraska? If so, where is the best place to view it, and also what would be the best time of night to see it? I know this is probably a very novice question, just trying to get a better understanding of what I can…
AndyWarren
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Cancelling out earth rotation speed, Altazimuth mount
I have a Dobsonian telescope.
It is using Altazimuth mount.
Basic idea of using it is to target the object by moving telescope vertical axis perpendicular to the ground, and an elevation axis that is parallel to the ground.
I have installed two step…
Kocur4d
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13
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Changes to Earth's orbit
Any time a spacecraft comes in close proximity to a planet and if the spacecraft has the right angle then it is able to use the planet's velocity to move itself further into space.
According to Newton's 3rd law: every action has an equal…
kalpetros
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Is there any evidence that the Gas Giant planets in our solar system are experiencing orbital migration?
Planetary migration is defined by Lubow and Ida (2010) in their article Planet Migration as
the process by which a planet’s orbital radius changes in time. The
main agent for causing gas giant planet migration is the gravitational interaction of…
user8
13
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1 answer
Sources of Turbulence in the ISM
What sources of turbulence exist within the Interstellar medium (ISM)? Which ones are physically the most important for newly forming stellar systems?
astromax
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Age of the universe
We know that the universe is approximately 13.7 billion years old. What methods did we use to discover this? How sure are we about its accuracy?
Rich
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What is the Lyman Alpha forest Used For?
The Lyman-alpha forest is an interesting feature found in the spectra of sufficiently distant objects. This series of absorption lines extends over a range of frequencies, and are a result of the Lyman-alpha electron transition of neutral hydrogen…
astromax
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Determining effect of small variable force on planetary perihelion precession
Is there an analytical technique for determining the effect of a small variable transverse acceleration upon the rate of aspides precession (strictly not a precession but rotation of the line of aspides) of a planet orbitting around the Sun in a 2D…
steveOw
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What is the orbital path of the newly discovered star-less planet PSO J318.5-22?
Recent results from Institute for Astronomy at the University of Hawaii at Manoa claim that there is a Jupiter-sized gas giant planet that is independent of a star about 80 light-years from Earth.
The press release refers to this planet as…
DQdlM
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Are galaxies growing, shrinking or stable?
When I look at spiral galaxies they look a bit like the whirlpool of water going down a sink and I wonder if eventually they shrink to a small point (or a giant black hole?). On the other hand they may be growing and being flung apart by centrifugal…
KDP
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13
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Multiply Earth's orbital speed with square root of 2
Earth's escape velocity is 11.18 km/s.
If I multiply Earth's orbital speed with the square root of 2,
29.7827 km/s x 1.41 = 42.11 km/s
How is this speed called?
I found this equation in an old German meteor book, but I don't understand.
Robert
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13
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Why are IAU constellation boundaries not rectilinear?
According to https://www.iau.org/public/themes/constellations/
Eugène Delporte of the Royal Observatory in Brussels presented
proposals for a clearly defined system of constellation boundaries
drawn along lines of right ascension and…
Gnubie
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Were effects of a planetary magnetic field reversal observed on other planets than Earth?
From geological records in rocks and minerals we know that the magnetic field of Earth changed its polarity multiple times in the history. See Geomagnetic reversal.
Was a similar process of a planetary magnetic field reversal observed on other…
pabouk - Ukraine stay strong
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