Recent comments in /f/space

Secret-Head-6267 t1_je9hs5x wrote

Or, all of the scientific journals were wrong. Bc everything that I have ever read on the subject of GRBs has been quite clear on the outcome of a direct hit, irrespective of any inverse square law involving wave propagation and x distance traversed in a near vacuum: total annihilation. Perhaps the Perimeter Institute and Neil Turok have some final words on this phenomenon? -J

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Mighty-Lobster t1_je9hlly wrote

>Fun fact. Same is true for the milky way, other star systems.

In the interest of clarity, while the galaxy as a whole is roughly on a plane, and almost every planetary system is roughly on a plane, those are not all the same plane. The planes of planetary systems are essentially random, and do not align with that of the galaxy.

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House13Games t1_je9g2pj wrote

gravity of all the planets pulling on each other pull them into a stable, flat plane. Imagine all the planets but one rogue one are in this same plane, like circles on the surface of your desk.. The rogue planet orbits at a big angle, so even if it is going in a circle, half of the time it is above the desk, and half the time below (like this: https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Orbit1.svg/1280px-Orbit1.svg.png - the grey is the plane all the planets are in, apart from the rogue one which is the yellow orbit) . When it is above the plane, all the other planets are located below it, and pull on it with gravity, down towards the plane. When it is below the plane, the planets in the plane are all above it, and they all pull it up. Over a very long period of time this brings the rogue planet closer and closer into the plane. Once within the plane, the planets still pull on each other, but there are no forces which would cause them to leave the plane again. Over time everything will settle into this single plane as its the only true long term stable solution.

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House13Games t1_je9g183 wrote

The planets all have gravity, which pull all the other planets just a little. Over a very long timescale this results in most of the planets lying in the same plane, like concentric circles on a piece of paper, and orbiting in the same direction. They are not exactly flat, they differ by a couple of degrees, but it's pretty flat. A couple of stray rocks and comets are much more inclined, some even perpendicular, but the planets themselves are very flattish, and this is known as the Plane of the Ecliptic. They are definitely not the same size though, and much further apart than is usually drawn.

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CremePuffBandit t1_je9fxbk wrote

All of the major planets orbit relatively close to the same parallel plane, but not exactly on it.

We usually compare other things orbiting the sun to the ecliptic, which is the fancy name for the plane of Earth's orbit. Most of the major planets are within 4° of the ecliptic, except Mercury which is at about 7°.

As for the dwarf planets; Ceres is about 10°, Pluto about 17°, and Eris is almost at 45° compared to the ecliptic, which is one of the reasons why it other Kuiper belt objects got recategorized.

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xopranaut t1_je9fq1u wrote

The solar system formed when enough of the material drifting around in space started to clump together due to gravity. As this happened, gravity and collisions caused the relative motions of most of this material to tend to cancel out, leading to the clump having an overall velocity and a spin (that’s just a result of the physics of the situation).

As the clump continued to contract, most of it became the sun, while other bits continued to orbit this, contracting independently. Hence the planets and other bodies in the solar system generally sharing a common plane and direction of orbit.

Other events such as collisions and large bodies passing by could change this.

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boundegar t1_je9f4pl wrote

Anything that's rotating has an axis, that just means the center of rotation. Most of the planets have axes that more or less line up with the Sun - they were born that way. The exception is Uranus, which is tipped over on its side. Nobody knows why, but probably something really big crashed into it, long ago.

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Riegel_Haribo t1_je9eu87 wrote

Planets all have an axial tilt, with different amounts of precession and oscillations of the magnitude of tilt.

The moon, being tidally-locked to Earth, rotates only once per month in relation to the cosmos, remaining relatively stable, with axial tilt similar to the plane of its orbit.

You might find this passage from Wikipedia "axial tilt" interesting, though:

The Moon has a stabilizing effect on Earth's obliquity. Frequency map analysis conducted in 1993 suggested that, in the absence of the Moon, the obliquity could change rapidly due to orbital resonances and chaotic behavior of the Solar System, reaching as high as 90° in as little as a few million years (also see Orbit of the Moon). However, more recent numerical simulations[30] made in 2011 indicated that even in the absence of the Moon, Earth's obliquity might not be quite so unstable; varying only by about 20–25°. To resolve this contradiction, diffusion rate of obliquity has been calculated, and it was found that it takes more than billions of years for Earth's obliquity to reach near 90°.[31] The Moon's stabilizing effect will continue for less than 2 billion years. As the Moon continues to recede from Earth due to tidal acceleration, resonances may occur which will cause large oscillations of the obliquity.

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Crow4u t1_je9ere0 wrote

Collisions with other body's would explain the rock worlds tilt but not sure the extent of influence on the outer ones.

One of the ice planets has 42 years of sunset to sunrise.

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