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83 views

Kardashev scale [closed]

Why is becoming a type 3 from a type 2 civilization the hardest? I have watched many videos on the topic and still can't figure out why? Also is there a difference in technology between a type 4 and a ...
3
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0answers
158 views

What is the highest resolution camera on a Mars orbiter? [migrated]

The GeoEye-1 satellite has the high resolution imaging system and is able to collect images with a ground resolution of 0.41 meters (16 inches) How about Mars then? From all the Mars orbiter's cameras,...
6
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1answer
386 views

Is there permanent dry ice on Mars? [duplicate]

Are there any places featuring permanent dry ice (carbon dioxide ice) on Mars? Is there dry ice at the poles?
5
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1answer
204 views

What are the Mathematical Algorithms/Formulas behind hindu Sunrise and Sunset Calculations?

There are differences between Astronomical Sunrise/Sunset calculation and Hindu calendar Sunrise/Sunset calculations. The astronomical algorithms to calculate the sunrise/sunset can be found over the ...
1
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0answers
42 views

Ice filled craters on Mars

How many craters on Mars have ice in them and which ones have permanent ice? I could only find Korolev and the unnamed one - strange for such a remarkable crater. http://www.esa.int/...
2
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1answer
71 views

How far can we detect lightning in radioastronomy?

The wikipedia article on whistlers has this information: Voyager 1 and 2 spacecraft detected whistler-like activity in the vicinity of Jupiter known as "Jovian Whistlers", implying the ...
1
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0answers
64 views

Radiation and software reliability in outer space [closed]

We all know that dragon was written in c++ but what i struggle to understand is that if radiation in space can really mess with hardware and functionality and even have the capacity to change bits ...
3
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0answers
41 views

How significantly does the intensity of a meteor shower diminish after the peak?

Every August 12 I take the family to the desert to enjoy the Perseid meteor shower. This year there will be an especially bright moon rising before 1:00, which is when the shower really peaks. Last ...
1
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2answers
45 views

How can I get/generate/extract PSF image from galaxy .fits image?

I want to model an image of a galaxy from Hubble. For this, I need the PSF image as well. I already tried to use TinyTim, but I don't have half of the parameters and cant be sure about the quality of ...
4
votes
1answer
53 views

What was the the value of the Hubble constant at the time of the CMB's 'release' (i.e., 379,000 years after Big Bang)?

What about its value roughly 9 billion years after the Big Bang, when dark energy started to 'take over' and accelerate the expansion of the universe? Is there a timeline or chart somewhere that shows ...
3
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2answers
45 views

Distinction between signal from terrestrial and signals from celestial sources

How is it confirmed that a radiation source (not in visible light) is either terrestrial or celestial? If in-depth explanation and/or references are possible, I would be grateful.
2
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1answer
49 views

Kinetic energy and galaxy arm rotation rate

The higher than expected rotational velocity of stars and gas clouds in the outskirts of galaxies is explained today by invoking dark mater that supplies not only the additional gravitational mass, ...
1
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2answers
67 views

Is there a way to know if there are/are not solar-system-like systems of objects without a star?

There's an extremely high amount of variation in All of Known Existence. We do see many many stars, with an extensive amount of evidence for planets orbiting around stars. However, is there are way to ...
2
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2answers
35 views

Corresponding values for the Sun's ultra violet color maps?

In my laboratory, we have an antenna to get data from the GOES-16 satellite and I want to reproduce NASA's nice visualization of ultraviolet images from the sensor SUVI. I can read the data without ...
1
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0answers
23 views

Does a rotating moon experience greater tidal heating than a tidally locked equivalent?

Tidal heating of a tidally locked moon is relatively straight forward to calculate, even though details of its internal structure is hard to work out in the first place. By contrast, tidal heating due ...
4
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2answers
89 views

Binary Star Initial Speed

I am writing a 2D simulation for binary stars orbiting each other. Currently, the initial position of the stars are on opposite sides of the screen with the left star having a velocity up the page and ...
2
votes
2answers
74 views

Can a single impact event trigger a runaway greenhouse?

Somewhat related to this question: Is the Earth going to evolve towards Mars' fate or Venus' fate? Human civilization may be fragile, but life itself is extremely resilient, with extremophiles and ...
21
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2answers
3k views

Was this an astronomical phenomenon observed in 1689?

In a Swedish church record from 1689 a phenomenon in the sky is described. With my very limited understanding it could be a meteorological or an astronomical phenomenon, so here I ask if it could have ...
24
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3answers
3k views

Is it possible to completely see the edge of a half moon at night?

Some days ago, about 1 ~ 1.5 hours after the sunset I could see a very bright half moon, and the interesting part is, I think I could see the edge of the dark half of the moon, i.e. a whole circle, ...
2
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0answers
44 views

Ideas for a project in astronomy and deep learning [duplicate]

I am currently pursuing computer engineering and am in my senior year. I'm looking for a long term project (ideally 2-4 months) in astronomy and deep learning. I have extensively worked on the Galaxy ...
3
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1answer
134 views

How fast is Neptune getting brighter? When was was this first noticed and reported?

This answer to Compute Planet's Apparent Visual Magnitude reports the new work on planetary magnitudes, and contains an intriguing blurb about Neptune: Neptune keeps getting brighter. No one knows ...
9
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2answers
1k views

When the sun “enters” a constellation, doesn't it make it impossible to see that constellation?

I was reading on NASA's website about how the Babylonians came up with dividing the sky into different slices and picked a pattern of stars in each slice to represent it. This ties in to astrological ...
2
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2answers
60 views

How to calculate the orbital period and the density of a planetary body?

I'm a student studying in 9th grade, I am making this fictional habitable planet named "Darwin B" for a planet making competition. It orbits a sun-like star at a distance of 1.15 AU or 172 ...
4
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1answer
70 views

How does using Tidal energy affect the moon?

Reading another question Where do we have it from that the Moon is migrating away from Earth? I makes me ask what effect does harvesting tidal energy for electricity production have on the rate the ...
3
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0answers
54 views

Has the computed change of the axial tilt ever been measured?

Earth, the 3rd planet from the Sun, sometimes faces earthquakes and seaquakes that are so strong that they reportedly change the axial tilt and/or the rotation velocity. These changes are merely ...
4
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0answers
56 views

Deformable optics for consumer telescopes

I am aware that there are adaptive imaging techniques for amateur astronomers. But these methods correct an image on a screen. This is nice, but to me the real lure of amateur astronomy is the act of ...
1
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0answers
14 views

Demonstration of scales for the two components (transverse and perpendicular) of Baryonic Acoustic Oscillations (BAO)

I transfer here a post that has not had any answer pn physics exchange, so I am going to delete this latter. Maybe I will have more luckiness here. In an astrophysics context about BAO (Baryonic ...
2
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1answer
124 views

Black dot visible when looking into the telescope

a few weeks a go i bought a telescope: The problem is I am a total beginner. I was able to setup the telescope correctly and i already saw the moon very clearly. Then I moved on to jupiter. When I ...
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0answers
19 views

Why are the W UMa variable subtypes labelled “A” and “W”?

The W Ursae Majoris variables (eclipsing contact binary stars) are divided into the A- and W-types. In systems of the A-type, the more massive component has the higher effective temperature, in ...
3
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2answers
100 views

Age of Jezero crater on Mars

How long ago the Jezero crater was formed on Mars? And is it a meteorite impact crater?
2
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0answers
60 views

Speculative Question Concerning the Planet Theia [closed]

I am a writer and I'm building a paradigm wherein the planet Theia did not strike the Earth, but settled into a orbit around the sun a third of the distance between the Earth and Mars. I wanted to ask ...
3
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0answers
34 views

What effect do aircraft have on night-time visibility?

I have something of an interest in astronomy. I also have a 5" reflector telescope, plus of course binoculars. With the recent coronavirus emergency, a large number of commercial aircraft were ...
0
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0answers
20 views

Can anyone give the idea of a Space Elevator? [migrated]

Actually I came across a very brief article about SPACE ELEVATOR. The article was regarding a problem related to general mechanics. But the most fascinating part was that how a counterweight at the ...
0
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1answer
39 views

How to read light curve from .fits?

I have a .fits file (this one, in fact) containing the data of a fast radio burst, FRB110523. Is it possible to, from that, make a simpler file containing the intensity (integrated over all bands) as ...
6
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1answer
1k views

Stargazing (Tenerife) - different quality today and yesterday

I'm on the Tenerife island and (in the mountains above the clouds - 2300) the day before yesterday, I could clearly see the Milky Way and stars (1 am). So I went to the same place yesterday and the ...
0
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1answer
43 views

How can I find the radius of a exoplanet using doppler spectroscopy [closed]

I have the stellar and planet mass, planet velocity, radial velocity of star, stellar semimajor axis. How should I go about to find the radius of this exoplanet?
1
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0answers
27 views

Calculate position of sun in sky

I would like to calculate the angle formed by the sun and the horizon for any hour of the day and any day of the year for a particular place on Earth. So like: what is the angle of the sun to the ...
0
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1answer
95 views

Possible Reason for the “NASA UFO sighting: Alien ship 25 TIMES size of Earth spotted near the Sun” news (does it fake or …?) [closed]

I have this news: NASA UFO sighting: Alien ship 25 TIMES size of Earth spotted near the Sun and tried to find the NASA site link by this link, but not found that news , so like to know what could be ...
1
vote
1answer
133 views

How did matter first come into existence? [closed]

How did matter come to be? Why is there matter if matter and antimatter cancel each other?
1
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0answers
39 views

clarification of radio spectrum

For a radio spectrum, when is it called thermal emission, synchrotron emission, self-absorbed synchrotron emission and inverted spectrum? They are all power-law and their difference is power-law index?...
1
vote
1answer
43 views

How to calculate the redshift of a line in a bunch of line spectra?

If in a spectra, there are many lines, mixed with gravitational redshift and non-redshift lines. For example, in this paper, they identify lines both redshifted and no-redshifted. Then how can i ...
8
votes
1answer
123 views

Will Jupiter eventually stop shrinking?

Jupiter is currently shrinking due to the Kelvin-Helmholtz mechanism. Will this mechanism eventually hold or getting slower? If so, at what size of Jupiter will it stop and why? If not, what will ...
8
votes
1answer
1k views

How many solar masses is the central black hole in the Whirlpool Galaxy?

I am having trouble finding the mass of the central black hole in the Whirlpool Galaxy M51a/NGC5194, it is stated that its companion galaxy NGC5195 has a supermassive black hole at its centre that is ...
7
votes
2answers
365 views

Why in my area does NEOWISE appear so dim and small?

So, I was always amazed by images of NEOWISE around the Internet like this: Or this: Yet, all my efforts to see it or photograph it in its full glory were fruitless... 22.07.2020 22:01 Here you can ...
1
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0answers
89 views

How does NASA's ASTHROS stratospheric telescope compare to its James Webb space telescope?

In Space SE I've asked Would it have been cheaper and faster to put a James Webb-like Space Telescope on a balloon instead of a rocket? I linked there to a few news items: CNET: NASA to send stadium-...
2
votes
2answers
107 views

Can a high enough density ignite a gas giant into a brown dwarf?

I wonder whether the nuclear fusion of brown dwarfs and more massive stars really depends on their mass only or if it could also start nuclear fusion if it is dense enough but not as massive as brown ...
1
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0answers
31 views

How long can the comet C/2020 F3 (NEOWISE) will observed with the naked eye or small optics?

In the answer to the question Where should I be looking to see Neowise in southern Sweden? there is a picture with the comet positions till 30 July. In other sources I saw similar pictures also with ...
2
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0answers
25 views

Is the magnetic field strength of a star predictable from mass, composition, age and angular momentum alone?

This answer to Which stellar properties can we describe as “first principles” in which we can derive the rest? contains an intriguing bit: That states that composition and mass are the two key ...
2
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0answers
28 views

How thick are the intergalactic filaments?

Recently, in October, news came out about the faint intergalactic filaments finally being 'found'. Then, in June, astronomers announced that these things had enough normal matter in them to solve the '...
1
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0answers
29 views

How quickly can a ring system be made?

I've seen elsewhere that if a terrestrial planet had a ring system, it would be very difficult (if not impossible) for life to evolve due to the shadow the rings would cast on the temperate zone in ...

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