0
votes
0answers
9 views

Are the Voyager spacecraft outside of our Solar System?

The wikipedia says that Voyager 1 cross the heliosphere, but is really outside the Solar System, or need to cross the Oort cloud?
0
votes
1answer
12 views

Is a swimming pool analogy to building of black holes in the centers of galaxies valid?

In our garden, we have a little pool to enjoy our 2 children. It is 3 meters in diameter and contains some 4 m³ of water. For cleaning-convenience every evening I go walking some 5 or 10 rounds in ...
0
votes
1answer
9 views

About the Outer Objects

Why do the light of objects such as the Sun, stars etc take time to reach our sight & our planet? E.g. Why does sunlight take 8 minutes to reach us, instead of reaching our sight as soon as it ...
0
votes
1answer
12 views

Black hole at Galactic Center of the Milky way and Bar of stars?

The Milky Way is a barred spiral galaxy, with a supermassive black hole at its center. Here As it is a barred spiral galaxy, it has a central bar-shaped structure composed of stars.Here So my ...
1
vote
1answer
31 views

Why are tides biggest during the equinoxes?

I've read that during the equinoxes, tides are at their maximum. Shouldn't this only apply to latitudes near the equator? I mean, when the solar declination is near to 0º and we have a full or new ...
6
votes
2answers
853 views

Do galaxies change shape and size over time?

Galaxies come in different shapes and sizes. What factors determine the shape and size of a galaxy, and how can these change over time?
2
votes
0answers
24 views

How does Astronomy, amateur and professional, contribute to humanity and a better world? [migrated]

I think this is a good question to ask. There are possibly many aspects to this question. Astronomy and seeking knowledge has lead to the development of space probes, space science, development of ...
-2
votes
1answer
29 views

Does Earth transit look like a black dot surrounded by red light?

As we know, lunar eclipse appear red, if we can see Earth transit from Mars, does it look like a black dot surrounded by red light on the sun?
2
votes
2answers
55 views

Can there be elliptical rings around a planet?

The rings of Saturn and Jupiter are circular. Orbits can be elliptical, so can rings be elliptical?
3
votes
0answers
50 views

How are heavier elements such as carbon and silicon distributed within the Sun?

In a previous question I asked about the source of carbon and silicate dust that Solar Probe Plus will encounter in its close flyby of the Sun. It seems likely that most sources would include infall ...
0
votes
0answers
24 views

Best format for analyzing and comparing coordinates across multiple tables

First coding project so if I am asking something wrong or asking too much please let me know. ANY help or advice would be greatly appreciated, including how to better word this question if necessary. ...
0
votes
1answer
29 views

Why can we trust Hubble Time if the rate of expansion is not constant?

The age of the Universe can be estimated from taking the inverse of the Hubble constant: $t_\text{universe} = 1/H_0 =d/v.$ It seems to me this method assumes that any given galaxy has been receding ...
2
votes
0answers
56 views

What is the origin of the dust near the sun?

In this question I asked about the Solar Probe Plus mission. Reading a 2008 report I saw that there is an elevated exposure to high velocity dust near the sun. I understand the high velocity, anything ...
1
vote
1answer
23 views

Is the radius used in the formula for the escape velocity the average radius of the celestial object or the radius at the starting location?

I learnt that the escape velocity is given by $$v_e = \sqrt{\frac{2GM}{r}}$$ Say I want to launch a rocket from the earth into space and want to calculate the escape velocity $v_e$ (I guess without ...
20
votes
4answers
2k views

Why does the Moon appear gray when passing between the Sun and the Earth?

Shouldn't the Moon appear as bright as a full Moon seen at midnight from Earth? The photo was taken by DSCOVR at Lagrange point 1. In the picture, The Moon appears dark gray. Of course the Earth ...
1
vote
1answer
28 views

Refraction by Saturn's atmosphere - how dense is it here?

This tweet from CassiniSaturn shows an image of Saturn's rings being optically distorted by the dense atmosphere. It is explained more fully on this page and is available here. The refraction is ...
1
vote
2answers
32 views

Can't find Cassiopias Schedar or Caph in Tycho-2 catalog supplement 1

I'm trying to locate three stars inside Cassiopeia, gam cas, Schedar, and Caph. I have found gamma Cas inside the Tycho-2 catalog supp1.dat file, however when I look for Schedar or Caph I have no luck....
1
vote
0answers
49 views

Is the sun really white? [on hold]

"If you could travel into space and look at the Sun without going blind, you'd find that it's actually white, and not yellow" "White light is composed of all the visible colors in the electromagnetic ...
-2
votes
0answers
32 views

Weird light in the sky, curious as to what it is [on hold]

One night (a couple days ago) I looked out my bedroom window and saw a red light. It was fairly big but obviously not close to the window. It was moving, back and fourth between the distance of a ...
0
votes
1answer
67 views

Parts of the Universe Shows Fewer Named Stars [duplicate]

I'm becoming interested in the currently identified stars in the universe. There is a wide swath where much fewer named stars are shown. Why is this? The image below is a mollweide projection of the ...
0
votes
1answer
68 views

Is this a real picture of the moon?

I found this picture and I am really wondering if it is possible for the moon to get as close to the earth as this picture shows? ( Super moon above Rio De Janeiro)
0
votes
0answers
22 views

Current communication delay to mars [migrated]

I'm not sure if I should ask this question here or on the Space Exploration Stack Exchange. If I'm on the wrong network here, please let me know. I read that the communication delay between earth and ...
1
vote
1answer
34 views

Using SkyChoord to read in multiple coordinates.

so I recently wrote a basic code to analyze the distance between two points which are stored in two separate excel files. Now that I have that code working its time to apply the legitimate use and use ...
1
vote
1answer
44 views

Jupiter, Saturn, Uranus, Neptune system GM

I'm modelling the solar system. I'm using data from Nasa. To do this I'm using the barycenter of the planets Jupiter, Saturn, Uranus, Neptune. However the website fails to give the Gravitational ...
3
votes
1answer
61 views

How far away is the nearest compact star remnant likely to be?

Neutron stars and black holes are hard to detect when they are solitary, and there seems to be big uncertainties about how common they are. White dwarfs are much easier to detect and the nearest one ...
0
votes
1answer
32 views

More than 67 Jovian moons?

Wikipedia says that there are now 67 known moons of Jupiter. It got me wondering: is it really possible in our day and age that there are more, but we haven't observed them yet? On the other hand, ...
3
votes
1answer
131 views

What is the temperature of the solar atmosphere (the corona) and how is it measured?

The temperature of the Sun's atmosphere, also referred to as the solar corona, is known to be hot even hotter than the Sun's surface. What is its temperature and how is it measured? How does it ...
4
votes
1answer
51 views

Is remote measurement of isotope ratios possible, or must a sample be aquired

Is it possible to measure to measure isotopic abundance of remote astronomical objects - ie measurement without having a sample to feed into a mass spectrometer? Do different isotopes show any ...
-3
votes
0answers
35 views

Planets, gem stones and their psychological effect on society [closed]

I have been having a pretty bad events happen to me lately. Any new undertaking turns sour. Situations that seemed to be getting better yesterday suddenly take a turn for the worst. For example I ...
-1
votes
0answers
40 views

Bright two moving lights on the night sky [closed]

About a month ago, I was out with my friends, It was midnight, and We were watching a bright dot in the sky. It was shining more than the stars. (It is there everyday, cca. 3 years, before that it ...
-4
votes
0answers
39 views

Why did the Big Dipper form? [closed]

There is an asterism comprising 7 stars, known as Saptarishi mandalam, but better known to the Western world as the Big Dipper. It gets its name from the seven rishis. Why did this asterism form, why ...
0
votes
2answers
32 views

Why celestial objects appear brighter in the night sky than in photographs from closer proximity?

The moon, for example, appears very bright in the night sky, but quite dark from photographs on/near its surface. Similarly, Mars and Venus appear as bright dots in the sky but in closer photographs ...
4
votes
3answers
74 views

Is it possible that a star system ejects an object out of the galaxy?

I know it is possible that a star system ejects a planet out of the star system and the planets becomes rogue planets and orbit around the galaxy. Is it also possible that a planet gains enough speed ...
1
vote
1answer
64 views

Interfacing FORTRAN programs for model atmospheres with IDL or Python

I'm trying to use model atmospheres such as Kurucz or MARCS for the first time personally and I'm wondering if it is better to wrap it with IDL or Python in terms of writing the code, and getting the ...
-1
votes
0answers
36 views

Stars in a straight line [closed]

I have observed many 2 stars which will be distant but seeing from here it will be in a straight line. Similarly 3 stars which is short distant to each other will be in a straight line. How is it ...
5
votes
0answers
35 views

What is the projected range of the JWST to be able to detect exoplanet atmospheres?

Yesterday the K2 mission detected transit events of objects passing in front of a number of M dwarfs which could turn out to be rocky planets. If some of these planets host atmospheres, could the JWST ...
3
votes
1answer
92 views

Can I get help getting image of Celestial Body at RA 2.220 and Declination +15.59?

My mom had a star named for my dad who died a few years back. I told her that I'd try to find an image of that star and send it to her. My dad's Birthday was 3/31/1931 if that helps. Would love ...
1
vote
0answers
20 views

Galaxy centre X structure - could this reflect impact of black hole at galactic centre

As reported in this science article X Marks the spot Centre of Milky Way, a X shaped feature is confirmed centered on our galaxy's centre, when looking on from within the plane of the Milky Way. In ...
6
votes
1answer
867 views

How far into intergalactic space would you have to go to see the Milky Way?

If in the distant future a ship were somehow able to move beyond the galaxy and into intergalactic space, how far would it have to go before we could look out a window and see the Milky Way in its ...
0
votes
1answer
56 views

Do far away planets reflect light in the same way our moon/earth reflects light?

Here’s a scenario: Say you’re up in space and you’re far enough way that you can see the planet earth. Whilst looking down, you can see blue sky, blue water and green land and white clouds and ...
1
vote
2answers
102 views

How often is a blue moon?

A blue moon is two full moons in the same month. How many times will a blue moon occur in the average lifetime of say 70 years?
-3
votes
0answers
39 views

New moon and full moon [closed]

When it is new moon we call it as amavasya . How does the moon grow and attain full moon. We call this as pournami. Again it is getting diminished. How does this happen?
3
votes
1answer
221 views

How many stars would it take to draw a line across the middle of the sky that appeared solid?

I was talking with a friend about how slowly the star field changes (based on the speed that we are moving through the galaxy) and I started to wonder about a star's visible size. They are basically ...
4
votes
1answer
46 views

Does Eddington's variable polytropic index better fit data from the Standard Solar Model?

I came across a 1938 paper by Arthur Eddington1 in which he discusses stellar polytropic models where the polytropic index $n$ varies inside the star, decreasing from a value $n_2$ at the surface to a ...
5
votes
2answers
2k views

how can a supermassive black hole cause so much energy to enlighten its matter when its massive gravity prevents light to escape?

to cite this german newspaper: Das Materie-Monster sitzt den Angaben zufolge im Herzen der 42 Millionen Lichtjahre entfernten Polarring-Galaxie NGC 660, deren Aktivität innerhalb weniger Monate ...
3
votes
1answer
256 views

Do stars start with rocky core?

Is it true that stars start with a rocky core, then collect hydrogen by the gravity of that rocky core, just like planets collecting materials?
1
vote
1answer
85 views

Where are the Moon rocks from Apollo? [closed]

There were so many Apollo Missions, and they landed on the moon (so they say). When astronauts came back to Earth from the moon, they brought Moon rock samples. Where are these moon rocks/samples now, ...
0
votes
0answers
16 views

How much do gravitational waves distort space near a black hole? [duplicate]

This is something that I've been wondering for a while, but I don't have the math background or general relativity expertise to figure it out (and Google seems strangely lacking in this question...) ...
0
votes
0answers
20 views

Which 16 antenna locations are used for the MeerKAT radio image recently announced?

The final configuration of the MeerKAT radio array will be 64 dishes. In the press release of July 16, 2016 a radio image is shown using a completed sub-set of 16 dishes. Which 16 are these? I can ...
0
votes
1answer
67 views

Do far away stars that we observe today still exist?

I don't know much about the astronomy or the universe but enjoy reading articles from time to time as they pop up. Just finished reading an article on CNN that discussed how a South African telescope ...

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