Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [planet]

Questions on astronomical objects orbiting a star massive enough to be rounded, not massive enough to cause fusion, and which have cleared its orbit of planetesimals.

1
vote
0answers
45 views

Celestron NexStar 130 SLT Computerized Telescope GoTo Not Accurate

I am trying to use a Celestron NexStar 130 SLT Computerized Telescope, but I am not able to use the GoTo function. I do the three start alignment, it confirms matches, I make sure the level is ...
0
votes
0answers
39 views

If our earth hits Jupiter would it completely explode because of its methane atmosphere? [on hold]

Considering that methane's composition in Jupiter is mere 10% or so but is it still enough to trigger a huge explosion? And is there enough oxygen(From earths atmosphere) for that to happen?
1
vote
1answer
59 views

Can't see any detail on planets with my new Celestron NexStar 130 SLT Computerized Telescope [duplicate]

Mars looks like a small white blob/circle and the same with all other planets. This is very frustrating. I've looked all over for a solution jumping from site to site and nothing. Please be different ...
3
votes
1answer
75 views

Is there likely other significant objects we haven’t discovered in the solar system?

In the last few weeks, I read a few news that presented new advances in our understanding of the solar system, which implied we don’t really know our neighboorhood that well. I was wondering, how ...
0
votes
4answers
222 views

Moon is a planet by “Clearing the neighborhood” condition?

Whether the Moon (Earth's natural satellite) is a planet is an old debate in planetary science. Though I do not agree that Moon is a planet, I found something difficult to clearly understand. ...
3
votes
2answers
65 views

A few questions regarding the transit of planets

Here we will be concerning ourselves with the transit of a planet with it's parent sun. I have a few questions that I am not sure about: 1) Do all planets transit their parent sun? It would seem to ...
1
vote
0answers
39 views

Distance between two planets [closed]

Planet A and Planet B orbit a sun-like star. Planet A has a semi-major axis of 1 AU from the star. Planet B has an albedo of .8 and has the same radius as Jupiter. When Planet B is observed from ...
4
votes
1answer
247 views

How do astronomers know if a planet is orbiting a star, or it's simply another star in the background?

For example, if astronomers photograph a "planet", which is in close proximity to a given star, then this "planet", could actually just be another "star" in the background, many light years away. It ...
4
votes
2answers
87 views

Could a moon be passed from one planet's orbit to another?

Like if you had two planets that had a close orbital path could the moon be pulled away from the first planet?
5
votes
3answers
149 views

Why do stars twinkle but planets don't [duplicate]

Many people say that stars twinkle because of Earth's atmosphere. However, the atmosphere is still there when we look at planets and don't see they twinkling. Is there a clear scientific consensual ...
33
votes
1answer
6k views

Considering our methods of exploration, how likely is it that there are unfound planets (not dwarf planets) in our solar system?

I think it's probably unlikely that there are more planets between Mercury and Mars, but out from Jupiter, there's lots of empty space between the planets. Could there be some small planet hidden out ...
-1
votes
1answer
50 views

Problems with computing X,Y,Z positions of planets at a certain time in Unity3D (C#)

I'm trying to create a little program in Unity3D that positions the planets in 3D space at a given time. I've followed this document: http://stjarnhimlen.se/comp/ppcomp.html. Using the data from ...
6
votes
0answers
127 views

What are Kepler's laws (as he wrote them)?

There are of course many, many sources that quote Kepler's laws of planetary motion. This is preventing me from finding out what I really want to know: which is - what are Kepler's laws as he wrote ...
1
vote
1answer
45 views

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

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
82 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 ...
0
votes
2answers
65 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 ...
3
votes
2answers
72 views

Can a planet's changing tilt be aligned with the rotation around its star? [duplicate]

What I'm asking is if the tilt of a planet can "follow" the rotation around its star so that, for example, its north pole would always lean towards the star, and thus always be under daylight. The ...
4
votes
0answers
61 views

“Pluto Time” for any solar system body

A while back NASA made a site called Pluto Time, where you can enter your address and find that "...moment near dawn and dusk each day, where the illumination on Earth matches that of high noon on ...
2
votes
1answer
68 views

How did early estimates of a “potato radius” set 1 eV ~ GMμ/R and get 200 to 300 km?

@DavidHammen's answer explains that Goblin has roughly a potato radius and I can't believe I just wrote Goblin and potato in a serious question. That happened. The linked paper; The Potato Radius: a ...
2
votes
1answer
60 views

How dependent is Earth is with the other Planets' gravity? [duplicate]

How would the Earth be affected if the Moon was destroyed as far as our orbit around the Sun? What if Mars or Jupiter was destroyed?
5
votes
3answers
131 views

Is the point of this paper to say that Pluto's status as a planet should have been handled scientifically, rather than by a vote?

The abstract of a paper currently in-press in Icarus: The Reclassification of Asteroids from Planets to Non-Planets (Metzger et al. 2018, https://doi.org/10.1016/j.icarus.2018.08.026) says: It is ...
0
votes
1answer
59 views

Planet with acid ice caps

I remember reading an old astronomy book mentioning a certain planet and the main point of interest was that this planet has or may have polar ice caps but of acid. I can't remember the name though, ...
1
vote
1answer
32 views

What is the apparent rotation time for a planet relative to an other planet?

Just my curiosity. This is not my assignment etc. Let planet A take m Earth days to complete one full round around the Sun, and planet B take n Earth days for one full round around the Sun. Assuming ...
1
vote
1answer
39 views

Would this effect occur if an ice planet was put into orbit or trajectory? [closed]

Imagine an earth getting warmer. Humans decide to make their homes ready for a voluntary ice age. All the space agencies work together to get an icy planet/moon into our orbit between us and the sun. ...
3
votes
1answer
100 views

We are in Green Lake, WI, 8/12/18, seeing bright orange “planet”/“star” almost due South, perhaps 20 degrees above horizon, what is it?

I have a “sky” app on my ipad and expected it to be Mars, but my app shows Mars just below horizon and closer to East. Oh, I should add that we saw this about 10:15 tonight. Hanging out watching ...
2
votes
1answer
64 views

Why are gravitational perturbations stronger at larger semi-major axes?

Why are mechanisms such as the Kozai-Lidov effect more prominent at at large semi-major axes? If we had a binary system of a primary and secondary body, with the third perturber as the Sun. Why is it ...
2
votes
1answer
1k views

Orange light in sky

It is 1:15 am, 8/10/18 in Indiana. I looked out my kitchen window and saw an orange light to the north with the color of a street light but clearly out in space. It was about as high as a full moon ...
3
votes
1answer
106 views

Is the dot on the photo - Mars?

The below photos were taken yesterday (August 4, 2018) at about 10 p.m. from the plane over the Black Sea. We were seeing the light dot on the left for at least 10-20 minutes. It looked like a bright ...
6
votes
2answers
319 views

Currently proposed ways to distinguish between a really big planet and a really small star

The Next Big Future article Rogue Exoplanet 12.7 times bigger than Jupiter is 20 light years away Astronomers using the National Science Foundation’s Karl G. Jansky Very Large Array (VLA) have made ...
3
votes
2answers
97 views

Why does Jupiter atmosphere does not get thinner on edges

Looking at Jupiter image the atmosphere edge of planet is very sharp as if it has solid surface which is not as it’s gases giant and there should be some thinning of atmosphere like we see around ...
2
votes
1answer
109 views

I have a Model 36050 telescope

My Model 36050 telescope came with the H6mm, H20mm and the green filtered moon lenses. It has a 360mm focal length and a 50mm diamiter. What can be seen with it?
4
votes
2answers
105 views

How to know the orbital and physical characteristics of the solar planets with only a non-professional telescope?

I have always been fascinated to see that with so little knowledge, scientists have succeeded in discovering the planets of the solar system, and have succeeded in defining them by their masses as ...
2
votes
1answer
53 views

Beginner looking for extra eyepieces for telescope

I have a Bushnell Voyager Reflector telescope. It came with 2 eyepieces: k4mm and k20mm. And I am trying to find additional eyepieces to zoom in further on planets and stars, but the bushnell website ...
1
vote
1answer
90 views

Could an Earth-sized planet be cold?

This question poses the question of why the Earth is still hot after 4.5 billion years, and the primary reasons were: (1) heat from when the planet formed and accreted, which has not yet been ...
2
votes
2answers
121 views

Struggling to use my new telescope

I recently got my first telescope, a Bushnell reflector telescope. I spent a good while setting up my alignment. And I can see the moon perfectly! I went to look at another, Mars. I got it aligned in ...
2
votes
1answer
384 views

Strange bright light in the sky flying fast [closed]

I was out with my dad on our porch watching the stars with our telescope. after awhile of looking and taking pictures I noticed something strange in the sky. There were two airplanes flying close to ...
1
vote
1answer
51 views

Why does in-the-sky.org say that Mercury is not visible from Taipei these days?

I know that viewing Mercury is a challenge, but I'm fairly close to the equator and Mercury was at greatest elongation just a week ago. In-the-sky.org says: All around the world, Mercury is ...
2
votes
2answers
10k views

Saw a bright orange object in the sky. What was it? [closed]

Some friends and I were backpacking in the mountains, and at night we saw a very bright orange object in the sky. It looked brighter than Venus. After a couple minutes we realized it was moving ...
2
votes
1answer
147 views

Simple mathematical models of solar systems

I’m a hobbyist programmer with a profound love for procedural content generation. I’m working on a 2D space exploration game and while it’s not meant to simulate anything real, I’d like to give it a ...
1
vote
2answers
87 views

Can a planet's gravity rip out its moon's atmosphere?

We all know that solar flares can rip a planet's atmosphere if the magnetic field is weak.Solar flares travel at tremendous speed so when they hit the gas molecules of a atmosphere the molecules are ...
7
votes
3answers
96 views

Is Mars brightest from Earth at opposition, perihelion or somewhere in between?

After reading this article, I was inspired to run some simulations at NASA's JPL Solar System Simulator to see Earth's and Mars' orbits from above. From what I could visually determine (from the JPEG ...
1
vote
1answer
83 views

Are large body orbits self correcting?

If a rogue planet disrupts Earth's orbit slightly to cause a long winter or summer will the Earth's orbit normalize back close its original orbit over time? Could a Planet X or some other elliptical ...
-1
votes
1answer
69 views

Where will the atmosphere of our Earth go if our sun blows it away completely?

What will happen?Will our atmosphere head to the next gravity dominant body?Will our moon hold a part of our atmosphere or is too weak to hold it?Where all those gases are supposed to go?
7
votes
1answer
154 views

Saturn's tropical year?

What is the value of Saturn's "tropical year" (as opposed to its "sidereal year"). I am seeing it listed as 10 days shorter (10,747 days) than the sidereal year (10,759.22 days). How could this be ...
7
votes
2answers
158 views

Why does each and every planet of our solar system have an unique axial tilt angle?

Why do planets have an axial tilt? From the above image we can see that each planet's axial tilt angle varies and differs from the others. What was the cause of this, was this from the beginning of ...
0
votes
2answers
212 views

Could planets explode in space?

Could a planet like the Earth or any other explode or be destroyed and did we see a planet explosion with Hubble?
1
vote
1answer
85 views

Where do gas giants end up?

I want to create a semi realistic star system generator but I am not sure where to "put in" gas giants. My guess is they can form pretty much anywhere within the sphere of influence of a star at the ...
3
votes
1answer
107 views

Why planets and stars are always round/oval in size? [duplicate]

What kind of stability it provides to each and every celestial body that each one them are round in shape?
4
votes
1answer
60 views

Is there any difference among exoplanets in composition due to host star?

Simply put, would, say, rocky planets orbiting red dwarfs have a noticably different chemical makeup than rocky planets orbiting B-type main sequence stars? Mutatis mutandis gas giants and the other ...
4
votes
1answer
81 views

Is the age of the solar system equal to the age of meteorites?

I've read articles that state the age of the solar system has been determined by measuring the amount of decay of isotopes in some meteorite, which has demonstrated that the lead isotopes in the ...