All Questions

1
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0answers
8 views

Have any notable astronomers considered the pilot-wave interpretation of QM?

According to a very recent paper called Bohmian quantum gravity and cosmology1: ...In a Bohmian theory, a system is described by certain variables in space-time such as particles or fields or ...
0
votes
0answers
5 views

What celestial bodies can be formed, resulting from a supernova explosion?

What celestial bodies can be formed, resulting from a supernova explosion? I have looked over multiple articles, and notes for my term, but just cannot seem to find what a supernova can form.
1
vote
1answer
27 views

What is the orbital period of our sun around its barycenter?

In years, what is the time it takes our sun to orbit around our solar systems barycenter?
0
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0answers
7 views

Average density of galactic filaments?

How many galaxies are typically in a galactic filament? Is there a known approximate minimum and maximum count?
0
votes
0answers
9 views

Nexstar 8SE trouble with sharp focus even watching distant trees

I have just received my Nexstar 8SE. Before planets, I have been trying to bring distant trees to sharp focus but to my disappointment, I am having subtle shades while watching tree edges. I tried to ...
1
vote
2answers
26 views

Is the passage of three asteroids near Earth today just coincidental?

I just saw in the advertisement-laden tabloid Express that three near-Earth astroids will pass the Earth today: The first of the three, dubbed Asteroid 2018 TU4, will come as close as 0.03637 ...
2
votes
1answer
41 views

What does it mean that the Sun`s rotation axis is: RA 286.13° , Dekl: 63.87°?

first post here. I found 1 related Question, which has not solved my Problem. SHORT QUESTIONs VERSION: Suns axis is 7,25° tilted from the ecliptic. But in which direction? LONG QUESTION: Nasa ...
0
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0answers
27 views

Advises based on taking Planetary Science as a profession [on hold]

Moving on to Year 10 or Tenth Grade in high school, I am intending to choose Mathematics, Additional Mathematics( which I think many of you are not familiar with), Biology, Physics, Chemistry and 3 ...
2
votes
2answers
31 views

What is the diffuse ionized gas?

I've been trying to find a clean definition what people mean by when they talk about diffuse ionized gas in the interstellar medium, but I couldn't find anything so far. Apparently it's supposed to be ...
1
vote
0answers
51 views

How can anyone analyse a planet using just some photons? [on hold]

I read the facts that there is a planet that is covered with burning ice and there is a planet where wind speed is 1000 times greater than that of earth and there is a planet in which depth of ocean ...
6
votes
2answers
2k views

Do all galaxies have a black hole in the center?

Would I be correct if I stated that all galaxies have a black hole in the center? Since other galaxies orbit around a center point in a galaxy - the barycenter, right? - I would assume at this point ...
0
votes
1answer
41 views

What's the composition of Ceres?

Strangely, there isn't a lot of information on Ceres on the internet. I want to know the specific percentages of its composition. Thanks in advance!
0
votes
2answers
52 views

How much radiation would something need to output to sufficiently affect the CMB?

Let’s say that I had some device capable of outputting insane amounts of radiation, across the entire EM spectrum. If I wanted to affect the CMB to the point that, were Earth-based scientists to know ...
2
votes
1answer
67 views

Is it possible to detect exoplanets with a teleobjetive?

I would like to know please if it is possible to find exoplanets with a teleobjective.
2
votes
0answers
30 views

What are the odds for any two bodies to collide during the milky way-Andromeda collision? [duplicate]

When the two main galaxies of the local group will collide, it is very unlikely for stars to collide with another, but how unlikely is it in the initial collision? And over the whole merging process?
0
votes
1answer
65 views

Array of telescopes with single orbiting collector?

Might such a thing give better images than we could get from other virtual telescopes with multiple collectors? Or is having multiple collectors not a limiting factor? Could a single collector ...
3
votes
0answers
83 views

Hudson Bay Has Low Gravity? [migrated]

Is there lower gravity at the Hudson Bay? How does this happen? And where exactly is this because I might want to go.
0
votes
1answer
47 views

How can the universe be expanding? [duplicate]

I assume expansion implies an increase in the volume of the universe. But if the volume of the universe is increasing, does that not imply the area it is expanding into's volume is being reduced?
1
vote
1answer
37 views

The specifics of two Earth-like worlds orbiting each other? [on hold]

I'm currently looking into writing a story or two set on twin worlds, which I came to find out in my research is apparently not a new idea (Double planets? Rocheworlds? Am I close?). But I want it ...
2
votes
1answer
70 views

Could Planet Nine be a tiny black hole or an exotic compact object such that it escaped detection? What would its bounds be?

Planet Nine (a variant of the old X-Planet and Tyche-Thelistos hypothesis) proposes a super-earth planet at the edges of the solar system with a mass of around ten Earths. However, given the interest ...
2
votes
1answer
34 views

What was the “optical illusion” that led to erroneous metal concentrations in stellar atmospheres in the galactic center?

Articles summarizing a recent result about certain heavy element concentrations in stars near the galactic center all say that earlier reports about high levels in stellar atmospheres were the product ...
17
votes
3answers
3k views

Can I sense a bright star pointing an eight foot antenna towards it?

If I connect an eight foot Yagi or other comparable sized antenna to my oscilloscope and point the antenna at a bright star will I see a voltage on my oscilloscope? I am not interested in turning the ...
5
votes
1answer
92 views

Why are there optical differences between sunrise and sunset?

I've noticed that sunrises are not reverse sunsets regarding the sky hues and lighting. Sunrises always start pinkish and end with a glorious yellow sunshine. On the other hand as the sun sets ...
3
votes
2answers
104 views

Why do we use the Planck length?

We are not able to quantize spacetime and the theory of loop quantum gravity has been proved wrong but we still use the Planck length in astrophysics. Why?
6
votes
2answers
114 views

What was the length of the solar day 73 million years ago?

How could this be estimated, or how accurately could it be extrapolated from a present-day measurement of the Earth's spin-down rate?
1
vote
2answers
113 views

Where is the center of the Milky Way located?

I have downloaded a star database from this page (The HYG Database): http://astronexus.com/node/34 And all the stars have (among other parameters) their XYZ coordinates in parsecs according to this ...
1
vote
1answer
41 views

angles on the celestial sphere

This is a somewhat simplified, and drawn / formulated in a manner more targeted to astronomy, version of a diagram and a question that I've also posted in math.stackexchange.com. In the diagram below ...
2
votes
0answers
43 views

Comparing accuracy in Starry Night and Alcyone Software

From what I understand, Starry night (https://starrynight.com/starry-night-7-professional-astronomy-telescope-control-software.html) is more focussed on simulating the night sky whereas Alcyone (...
5
votes
1answer
85 views

Why is there a Phillips relation?

I want to know the explanation of Phillips relation, the relation seen in type Ia supernovae(SN Ia with broader light curve is brighter). More Ni-56 implies a larger luminosity at peak but what about ...
0
votes
0answers
41 views

Determining distances of galaxies to other celestial objects

I have a huge set of galaxy clusters at intermediate red shift, and I wish to know their relative distances to each other in order to compute the k closest neighbor distances, where k is some ...
0
votes
0answers
39 views

Viable near term faster than light technologies [closed]

I am asking this question to simply see what possibilities that are out there for faster than light travel for our hopefully soon interstellar civilization. Everything is fair game but I personally ...
2
votes
2answers
56 views

Cardinal directions in solar system?

Does the solar system also have cardinal directions? Which one is North and in what direction does it point?
3
votes
3answers
96 views

Why type Ia supernova reaches its peak absolute magnitude(~ -19.3mag) at around 15-20 days after the explosion?

I'm not sure why type Ia supernova reaches its peak magnitude 15-20 days after the explosion. Is this luminosity generated only by the radioactive decay of nickel-56 to cobalt-56?(considering a half-...
0
votes
2answers
52 views

Since gravity is like an indent on a piece of paper (the space/time matrix) to a marble, can the black hole eventually suck in the matrix?

Can a black hole suck in time? People claim that if you were to put a bowling ball on a trampoline and rolled much smaller balls through the deppression, some would stay in "orbit", some would roll ...
0
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0answers
80 views

Would a magnetic charge over the Schwinger limit create visual effects in the vacuum of the solar system?

Say, hypothetically, that you use a variation of the Takeyama electromagnetic coil experiment (https://www.space.com/41950-magnet-physics-doors-tokyo.html) to generate a short lived but very extreme ...
0
votes
1answer
29 views

Are there any known asteroids with average density similar to that of Earth's?

In this answer I mention that for very low orbits around spherical bodies, the period tends to scale only as the inverse square root of the density, and not the diameter. For a low orbits where the ...
2
votes
0answers
34 views

2D Distorted Star Map for Pasting on Sphere Surface

Are there printable 2D star maps that are distorted such that, when printed, they can be cut (along printed lines) to be applied to the outside of a sphere to represent the celestial sphere, as seen ...
2
votes
2answers
51 views

How exactly 'polar aligning' a Telescope with equatorial mount helps?

What is true purpose of polar aligning? Last night, I looked at Mars. It was moving fast. I still need to adjust RA axis to track fast-moving Mars. Why the telescope didn't track it by itself?
6
votes
1answer
109 views

Could a black hole pass quiescently through the Oort cloud?

Imagine a stellar-mass black hole passing through the Oort cloud, perhaps a quarter to half a light-year from the Sun. How black would the black hole be? That is, any matter that fell into the black ...
1
vote
0answers
15 views

Fast moving bright star with eliptic course, instant stop [duplicate]

Around 13 years ago I saw fast moving bright star with eliptic course which crossed half a sky in 1-2 sec and stopped instantly like it was a smashed like a bug, and didn't move for a while few ...
2
votes
0answers
22 views

What is the advantage of taking monochrome photographs in standard lenses

I've readen "When photographing faint objects monochrome photos will resolve more than RGB pics" Is this really a thing? If yes, how?
1
vote
1answer
36 views

Could Confirmation of a New Planet Strain the Definition of “Solar System”?

Voyager 1 (https://en.wikipedia.org/wiki/Voyager_1) is approximately 140 AU away, and is considered to have left the solar system. Now, the layman's definition of solar system provided by Google is: ...
1
vote
1answer
56 views

Move asteroid away with white color?

If we find asteroid flying towards us, can we change it's direction with white painting? Will the ray from sun do something?
2
votes
1answer
63 views

What is the planet relative to earth that shows the greatest change in apparent brightness?

What is the planet relative to earth that shows the greatest change in apparent brightness? I think the answer is Mars, and a quick google search reveals it is Mars. I have my reasoning here, but I ...
1
vote
1answer
38 views

What is the nature of “rock vapor” in this description of the formation of the Moon?

The NPR News item MacArthur Fellow And Planetary Scientist Sarah Stewart Discusses How The Moon Was Formed and audio podcast begins: Ari Shapiro, Host: Sarah Stewart likes to think about what ...
0
votes
2answers
48 views

Tables of aphelion/perihelion dates for other planets?

It's relatively easy to find tables for Earth aphelion and perihelion dates and times, such as this one: http://www.astropixels.com/ephemeris/perap2001.html But what about the other planets in the ...
6
votes
2answers
65 views

Where exactly is the modification that first corrected the spherical aberration in Hubble's primary mirror?

The April 2015 CBS News article How NASA fixed Hubble's flawed vision - and reputation describes the modification taken to the Hubble Space Telescopes by the Space Shuttle that was used to correct for ...
3
votes
1answer
38 views

Could the E.H.T. produce an image of the human artifacts on the moon?

Two days ago the New York Times featured the Event Horizon Telescope (E.H.T.), a huge virtual radio telescope emerging from combining data from several dishes scattered around the world. While the E.H....
0
votes
1answer
18 views

What are the real conditions for the creation of an atmosphere/loss of an existing atmosphere?

Overview: Taking a planet Ganymede for example (moon, technically I suppose). Ganymede is huge (well, in contrast to other bodies) and I've noticed a pattern between larger bodies and atmospheres. ...
1
vote
2answers
56 views

Is there a limit to how fast spacetime can bend/warp around an accelerating object?

If in the future a spaceship can accelerate to nearly the speed of light, will it encounter any kind of resistance/drag from the spacetime in front of it not being able to bend/warp fast enough around ...

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