Planets Definition and 509 Threads

How would they look like? Being more specific and less speculative: would higher atmospheric pressure (ex. 5 atm) mean that it is easier to fly/glide because lower wingspan would allow to achieve the same lift? Or it would be actually harder, because denser atmosphere would mean higher drag...

We can determine what kind of elements exist in different planets by observing electromagnetic waves from planets' direction, but does anyone have any suggestion on how planets generate electromagnetic waves at the first place? Does anyone have any suggestions? Thanks in advance for any...

Hey there I was wondering: Are the stars and their systems in our galaxy stable relative to each other? I mean - how fast do they move in relation to one another. Are there significant time dilation on some planets or systems in our galaxy relative to us? I'm thinking about this because I...

Is there some liquid planets out there? well there are gaseous planets... what are the laws that avoid the existence of a giant liquid planet with a little rocky nucleus?

Orphan or 'rogue' planets may be common, rather than an exception, at least in the galaxy. http://news.yahoo.com/orphan-alien-planet-found-nearby-without-parent-star-122308193.html But how common?

Homework Statement A planet orbits a star of mass M = (3*10^30)kg in an elliptical orbit. The planet is r_1 = (0.8*10^11)m from the star at its closest approach (periastron), and r_2 = (1.6*10^11)m at its furthest (apastron). (G = (6.67*10^-11) Nm^2kg^-2) (a) Calculate the semi-major...

Description: An extrasolar planet can be detected by observing the wobble it produces on the star around which it revolves. Suppose an extrasolar planet of mass revolves around its star of mass . If no external force acts on this simple two-object system, then its CM is stationary. Assume and...

"Periodicity" in the mass of planets? Hello, I've recently come across a very odd article (link at the end ot my post) in the internet, and I'd like to hear other opinions on this topic. The article claims that the mass ratios of Earth with any other planet in our solar system can be...

Hi! I have worked on this for a while and cannot seem to get a reasonable answer. I have been given the Luminosities of planets at different wavelengths and I need to determine the Temperature. I re-arranged Planck's equation to find T but I keep getting really low temperatures Planet A...

Hi I am making a solar system emulation. I need some fairly precise velocities for the planets as a start velocity of the planets and since i calculate the gravity i need it perpendicular in a known distance from the sun. First of all.. is it correct that if i calculate gravity i would...

Can we give an analogy for nucleus to sun and electrons to planets...... Hi all, Can we give an analogy for nucleus to sun and electrons to planets...... like this in several galaxies... and galaxies together form some other material in larger scale. Also can we say wave nature of...

Hi everyone! I was wandering how can i find out which is the position of a planet relative to sun, in our solar system using the math?

I have information that time slows down in space. For example if an astronaut is on the Moon or in space for one year, he didn't age. If he returns to Earth he is as young as he left Earth? I don't understand this. If someone travels to another planet (3 months journey through space), I...

Copy the table and determine keepers third law constant ku for Uranus using the data for the first floor moons sorry for the mirror effect its the only way i could get the page so you could read it .. its on the right # 32 b) find the average of the Ku, values of your calculations...

I understand how planetary orbits are described by Kepler`s laws, and how planets in our solar system have the different orbital velocities that they have. But I was wondering that if those planets are just the ones that during the solar system creation, due to their initial velocities were able...

Homework Statement On Earth you are able to consistently hit a golf ball 156 meter when you use your 5 iron which launches the ball at a 23 angle with respect to the ground. If you were to perform this same shot on the surface of an unknown planet called x, and be able to hit the ball 200 m...

Einstein predicted a slightly quicker orbit for planets very close to the sun that will deviate from Newton’s gravitational laws very slightly. Later observations, as we know, have proved correct and General Relativity holds up. But what is the perceived reason as to why this is? What is the...

Pretty straight forward. The same generally holds true with moons belonging to the same planet. If we don't have concrete reason why this occurs, are their any strong theories?

Homework Statement The question is: "Derive the relationship between a planet's synodic period and its sidereal period (Eq. 1.1). Consider both inferior and superior planets." Figure 1.7 and Equation 1.1 are attached. Homework Equations Attached. The Attempt at a Solution The...

Gravitation -- Why don't planets smash into each other? Why don't planets smash into each other? The universal law of gravitation states that everything pulls everything else in the universe. Using this logic shouldn't the Sun move because it should be experiencing the pulling force from so...

Planets are said to be uncharged... Leave about the rest but we consider Earth as a negative potential (I suppose)... :-p please clarify my doubt...

Hi dudes, My questions are: What does planet's revolution depends? If for example is there a planet 4 time the mass of the Earth at about its same distance from a star 4 time the mass of sun, could it be it has the same revolution period ot the eath?

I don't know much about this, only looked into it a bit yesterday. If you know more or can find out something, please contribute. Abraham Loeb (eminent Harvard astroph.) says, if I understand him correctly, that light from stars richer in heavy elements than the sun has been observed at...

This is not a homework question. I'm just interested. My friends and I have been discussing this problem. I want to know an equation to calculate how high I can jump on another planet as a function of the planet's radius, mass, wind resistance, rotation, latitude and height they can jump on...

why do planets move around stars in the same level ? why do stars move around black holes in the same level? why don't some of them move in horozintal level & the others in vertical level?

This link got me thinking. Has anyone else read Trader to the Stars by Poul Anderson? He describes an alien ecosystem around a red dwarf star where the life has adapted to the frequent solar flares and everything has learned to take cover when the flares come. Somebody was thinking ahead!

Homework Statement Two planets X and Y travel counterclockwise in circular orbits about a star as shown in the figure below. The radii of their orbits are in the ratio 4:3. At one moment, they are aligned as shown in figure (a), making a straight line with the star. During the next five...

Why Don't Planets "Fall" into the Sun? Ok, guys, I am new to physics (just studying it on my own before taking it next year in school) and watched a bunch of videos online about general relativity and gravity. I'm sort of stuck, though, with why if general relativity explains gravity as...

Homework Statement Consider two uniform spherical planets of equal density but unequal radius. Which of the following quantities is the same for both planets? Homework Equations The Attempt at a Solution I can't really attempt to solve it because it's not really a "problem."...

Something similar to this came up in a lecture but it wasn't explained very well. From wikipedia it seems that our sun is made up of 74.9% Hydrogen and 23.8% Helium. The final 1.3% is made up of heavier elements such as oxygen, carbon, neon, and iron. If the the entire solar system condensed...

As from the title, I am trying to find for Venus, Earth, and Neptune: a) the orbital angular displacement in one day in radians b) the centripetal acceleration c) the centripetal force Relevant Equations: Centrip accel: ac=v^2/r=4pie^2/T^2 Centrip force: Fc=ma=mv^2/r=4pie^2mr/T^2...

Number of "homeless" planets So I stumbled upon this article and wanted to get others opinions of it. The short and long of it is it is claiming that there are roughly 100,000 X as many planets wandering about our galaxy (not attached to a star) as there are stars in our galaxy. Seems a little...

First excuse my grammar english is not my first language My question is does the speed at which the planet is revolving on itself, the speed at which the Earth is rotating around the sun and the speed at which the milky way is traveling throught space is affecting the rate at which time flows...

I remember reading an article on exoplanets which suggested that when a star loses its mass, the orbital radii of the planets orbiting it increase. Apparently this makes it easier to identify such planets as they are now further away from their star. What I would like to know is, what...

Okay so I just had this problem on my astronomy midterm and I was sort of stumped by it. I hope I can remember all of it. Basically there are two planets orbiting around what appears to be a blank area of space. From observations we can see that they are not in a binary orbit with each other...

Homework Statement What effect will the tangential component of force have on the velocity of the planet? What effect will the normal component of force have on the velocity of the planet? Homework Equations The Attempt at a Solution 1. Since it is parallel to the direction of velocity, maybe...

planets do not loose energy when they orbit the sun due to interplay of centripetal and centrifugal force. Then why is this system not able to explain that electrons do not loose energy while orbiting the nucleus?

As we know there is gravity force between Planets in order to hold them in orbits, Each planet has different speed in term of its rotation, will it create any force in any way? does anyone know how many kinds of force exists between planets as we know at this moment? Thanks in advance for...

is the phenomenon of rotation of planets best explained based on frame dragging due to sun? If so does universe rotate as a whole. What causes it. I am really beginner. Forgive my ignorance.

As my state (Indiana) has removed Astronomy from the curriculum, my school no longer offers it. I have taken AP Physics B and that is my best knowledge provided by the modern school system, so I apologize ahead of time for any low-level or simple questions. I am wanting to know the equations...

How many TJ of energy is necessary to get a 300 ton spacecraft from the surface of Venus to 1) orbit at 60520km and 2) to leave the planets gravitational field? 12104km Venus diameter 6052 is Venus radius therefore. 4,9 * 10ˇ24 kg Venus mass 60520km orbit radius T-1,9 Earth days...

The sun appears yellow because is made of white light and blue,green,indigo gets scattered.My question is why the planets and the moon appear white with their case the same thing should happen and even they should appear yellow.

http://www.washingtonpost.com/national/health-science/astronomers-detect-first-earth-sized-planets-orbiting-another-star/2011/12/20/gIQAuRIJ7O_story.html

Homework Statement Here is the text of the question: "A satellite circles planet Roton every 2.8 h in an orbit having a radius of 1.2 X 10^7 m. If the radius of Roton is 5.0 X 10^6 m, what is the magnitude of the free-fall acceleration on the surface of Roton?" Homework Equations...

A Martian civilization is attempting to develp the capabilities for space travel. They have built a prototype satellite with a mass of 578kg that they plan to put in orbit Mars a distance of 602km above the surface of mars. A) Using the data provided, calculate the orbital velocity of the...

It seems to me, from my understanding of the Lagrange points, that a binary system with the appropriate mass ratio between stars could support planets in the L4 and L5 Lagrange points (I've encountered this, actually, in science fiction; Larry Niven put such a planet in the Procyon system for...

Extra Giant Planet May Have Dwelled in Our Solar System http://www.space.com/13584-extra-giant-planet-solar-system.html If that were the case, then where did they go?! The article also states that "a large number of free-floating worlds have recently been discovered in interstellar space...

How to simulate planets orbit curve around the sun ? Hi I'm about to write a java program where I wish to simulate planets orbit curve around the sun, so that I can set the speed of a planet and mass of planet and sun and simulate the curves around the sun (just basic simulations). I only...

Hello Everyone, I kind of followed this document http://pages.physics.cornell.edu/~aalemi/random/planet.pdf until on page 3, author explains What we are trying to due, is build the planet such that each chunk con- tributes as much as possible to this integrand...

Homework Statement Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 41.7 km/s and 55.5 km/s. The slower planet's orbital period is 8.04 years. (a) What is the mass of the star? (b)...