402 Answered Questions for the topic astronomy

Astronomy Orbital Motion

06/22/19

How does the view of night sky change as the Sun orbits around the Milky Way?
I know that the Sun and hence the Solar System orbits around the galactic center of the Milky Way. Does this rotation cause any visible change in the night sky?I know that human life span is... more
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06/21/19

Does a celestial system exhibit a collective magnetic field?
Sol exhibits a magnetic field, most of the planets in orbit around Sol exhibit a magnetic field - strong and weak both. Does the solar system as a whole exhibit a magnetic field? Does the paradigm... more
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Astronomy Gamma Rays

06/21/19

Can gamma rays be used to investigate heavenly bodies?
This is a very layman level question. I watch a lot of documentaries, that's my only qualification. I have seen in documentaries that gamma rays have an extraordinary penetrating power. So if we... more
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Astronomy Astrophysics Stars

06/21/19

What are the demographics of stars visible to the naked eye?
Of the stars that can be seen with the naked eye, what are the distributions of each type? For example, how many are main sequence? how many are Super Red giants/white dwarfs/neutron... more
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Astronomy Orbital Motion

06/20/19

How is celestial navigation done on a low-level?
When we send a probe off to Jupiter or Saturn, or even Earth orbit, how are the rocket firings timed and coordinated?For instance, when I want to drive to another city I pull onto the highway and... more
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Astronomy Moon Color Different

06/19/19

If the moon was purple what colour would the sun be?
Think if instead of white the moon would be purple!Based if this considering the sun gives the moon its light and the moon sometimes appears orange like the sun in turn what colour would the sun... more
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Astronomy

06/19/19

The most likely method of communication with extra-terrestrial life-forms is probably through...
A. Interstellar space travel (spacecraft).B.  Radio C. Smoke Signals.
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Astronomy Orbital Motion

06/18/19

What tools do I need to track an orbit of a mystery object?
A while back I was observing Uranus with my 6" dob and a moving object tracked across my field of view. I was at about 90x at the time, and the object was pretty bright but slow moving. I dropped... more
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Astronomy Neutrinos

06/16/19

Is a fast acting high efficiency neutrino detector possible?
Todays detectors rely on rare interactions (with matter), which makes them large and slow. Is anything much better even possible?
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Astronomy Planets

06/16/19

What planets are visible to the naked eye from Mars?
Here on Earth we are able to see some other planets, Mars & Venus etc, with the naked eye on a fairly regular basis thanks to the distance between the planets.What about from Mars? What... more
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Astronomy

06/15/19

How much energy would a single photon have if its wavelength was 470 no?

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Astronomy

06/15/19

If a radio station carrier signal is an electromagnetic wave that has a frequency of 103.3 MHz, what is the wave’s wavelength?

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06/15/19

How do we estimate $10^{23}$ stars in the observable universe?
Now, I read somewhere, that there are 4,106,234 stars in the observable universe. How did scientists estimate this?
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06/13/19

Can any telescope be used for solar observing?
Can any telescope, such as a 8" reflector, that is normally used at night to look at planets be used or adapted for solar observing?What kind of adapters or filters are required or is it better to... more
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Astronomy Comets

06/13/19

Could two colliding comets near Earth cause devastation?
Let's say two comets crashed into each other. If it was 0.1 AU away from the Earth, would the collision cause mass destruction here, or not affect us at all?
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Astronomy Telescopes

06/13/19

How can I determine if my telescope mirror is parabolic?
This week I purchased the “Skywatcher Explorer 130P Newtonian Reflector Telescope”, specifically as it has the parabolic mirror. I do not have the outer packaging for sundry reasons. Therefore,... more
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Astronomy Science Physics

06/11/19

Whereas the vast majority of astrophysicists support the big bang theory, many nonscientists consider the theory to be controversial. Why do you think so many people might object to the theory? 
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06/08/19

Precision of spectroscopy for astronomy?
How precise can the measurements be when looking at spectral lines in astrophysics?For example, suppose I have a telescope in orbit, and I am looking at $H_\\alpha$ lines coming from a star at 613... more
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06/08/19

How is the atmospheric composition of objects in the Solar System measured?
How is the atmospheric composition of astronomical objects, for example Triton, a moon of Neptune, determined?
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Astronomy Astrophotography

06/05/19

Why do astronomers never put a scale on their photographs?
Why do astronomers never put a scale on their photographs? I have been looking at images of the Bird nebula, a collision of three galaxies, but in none of the dozen or so that I have found, nor in... more
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06/05/19

How to explain the existence of heavier elements in Population I stars and in Population II stars contain lighter one?
Recently I read Astrophysics Notes where I found a statement that young stars are classified as Population I stars and relatively older one as Population II stars. Population I stars contain... more
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06/05/19

Galaxy Spectra: Emission and Absorption Lines?
Spectra from galaxies include both absorption and emission lines. I do understand how both types of spectral lines are produced but I am not quite sure where each type is coming from when we... more
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06/05/19

Why don't the relative positions of stars and other objects in a galaxy change over the year?
Though the identifiable stars in a constellation (say Andromeda) and a galaxy (say the Andromeda galaxy) are situated light years apart, why doesn't the galaxy appear at different positions with... more
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Astronomy Cosmology

06/05/19

How is Doppler redshift of distant galaxies established?
Doppler redshift of distant galaxies gave first hint that the universe is expanding. I am curious to know how this redshift is actually measured and interpreted from observation. Suppose I observe... more
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Astronomy Biology Vision

06/05/19

How much sky do we see at any one moment?
When we look at any particular point the sky, what percentage of the celestial sphere do we see? This question arises from the notion that on average there passes one meteor per hour overhead. So... more
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