What's this retrograde of Jupiter, Saturn, Pluto, Neptune, Mars is happening at once mean? Is it common to be in retrograde for these numbers of planets at the same time?
As far as Hindu Vedic astrology is concerned, Pluto and Neptune are not considered. All the seven Planets are constantly moving around their perimeter at the assigned speed in same direction. Each has different speed. These planets sometimes create visionary effect like one or more are stationary or moving backwards. This effect is called Retrograde effect. Imagine you are driving your car along the Highway at speed of 80 Kms/Hr. Other vehicles are also moving in same directions. All have variations in speed. A situation is created when a vehicle is moving faster ( by it’s original speed ) than yours. When it matches your speed, you feel that car is stationary. But soon it may pass you and that passing speed creates a visionary effect that your car is backing up. In fact your and all other cars are moving with their own speed. This is what exactly happens as regards the Retrograde Planets. There can be many combinations when none, or one , or more than one Planet may create such visionary effect without any actual change in their assigned speed.
Why does the orbital period of planets increase as their distances from the Sun increase?
A2ABecause of the way orbital mechanics works. There are two forces acting on a planet. Its inertia which tries to keep the planet moving in a straight line, and the gravity of the Sun, always acting on the planet towards the center of the Sun’s mass.The further away from the Sun the planet orbits, the weaker the gravity. Therefore to balance out and stay in orbit, the planet needs to travel more slowly. And, at a “higher” orbit, it also has much farther to travel for each circuit.So it has further to go, and travels that distance more slowly. So its orbital period is much longer the further out it is.During the formation of the solar system, as material condensed towards the center of mass, it spun faster and faster. We usually use the example of an ice skater; the skater starts a spin, then as she draws her arms closer to her body, her rate of spin accelerates significantly.If any material was somehow spinning too fast for the “height” of orbit, it would have broken free and drifted away from us.Of whatever gases hung around to form our solar system, some of it was spinning too slow; in fact, 98% of the gas was moving slower than needed to maintain an orbit, so it was pulled into the center to eventually form our Sun. Of the remaining 2%, these parts of the spinning cloud were dispersed over a fair distance, and were spinning at just about the right speed to maintain there distance from the newly forming Sun. There was still a lot of chaos of movement, of course, so new concentrations started to gather together, and eventually formed our planets. The asteroid belt I believe failed to become a planet because Jupiter was so big, with so much gravity, that it kept pulling these pieces apart, disrupting their attempts to gather into a planet.And that’s basically it, in really simple terms. The slow stuff “fell” into the center to become the Sun, the fast stuff spun off into space, and the “just right” eventually collected into masses big enough to form the planets.
There are two planets in our solar system whose orbits intersect each other. Why don't these planets collide?What will happen if they collide?
Pluto’s orbit does take it both nearer to and farther away from the Sun than Neptune, so the orbits do collide in that sense. But the timing is such that they are never in the same place at the same time, and never will be. They have an “orbital resonance,” and the effect each one’s gravity has on the other is such that they stay in this relationship. This is so even though Pluto is no longer officially a planet.Incidentally, two of Saturn’s moons, Janus and Epimetheus, are “co-orbital.” They have essentially the same orbit, but their mutual gravitational interaction is such that about every four years they trade orbits, swapping which one is closer to Saturn. This is not only stable, the math checks out perfectly!
What would happen if our planet disconnected from the orbit from the sun?
The Earth would look like a complete idiot.Earth as it drifts by Mars: “Hey! Long time no see, eh?”Mars: “Uh bro… What in the universe are you doing?”Earth: “Taking a break from this ‘orbiting’ stuff, it gets real old.”Mars: “But bro, you have life… Everyone wants life. You will become me cause I certainly do not have a ‘life.’”Earth: “That’s the whole point…”Well, that's actually not what would happen.What would actually happen is that the Earth would eventually freeze. But that's only if it misses the other planets and asteroids in the system.In the end Everone Dies™.
Why are terrestrial planet made up of less dense elements than Jovian planets?
Current models of solar system formation say that a new star is surrounded by a protoplanetary disk. Essentially this is a disk of material left over from the formation of the star itself and will contain gases, ice and heavier elements (silicium, iron, carbon, calcium,...). From very early on material begins to clump up in the disk and 'grains' grow from dust to pebbles to the size of lage asteroids. Terestrial planets are expected to form closer to the star and jovian planets (gas giants) further away. Two factors are believed to contribute to this: 1) Gas giants form further out, their orbits cover a larger perimeter, therefore they are able to accrue more material. Once they become massive enough (abouve 7 Earths, more or less) they are able to retain an extended atmosphere (because hydrogen and helium don't escape anymore) and just keep growing by accruing more asteroid material and gas. Terrestrial planets never grow very big, and are only able to retain a small atmosphere as a result of their small mass. As an example of this model we have Earth, which we all know has an atmosphere, and Mars (about half Earth's size) which is believed to be to smal to retain a stable atmosphere. 2) Volatiles (hydrogen, helium, water, CO2, methane, ammonia,...) are gases or will quickly become gases in the inner solar system once the star in its centre begins to shine and warm up. The solar wind then blows these away and they disperse from the inner solar system too quick to allow planets there to build up a large atmosphere. In the outer solar system these substances are available for longer and can therefore be incorporated in large amounts in the atmospheres of planets further out in the solar system.
Why do more distant planets take longer to orbit the sun?
The gravity of the Sun is weaker at greater distances. If a planet orbited at the same velocity as an inner planet, it would be going fast enough to acheive escape velocity, not orbital velocity. The larger orbital radius does also play a role. If the total distance traveled is greater, and the total speed is slower, it will take longer to complete an orbit. Johannes Kepler showed in the 1600s the relationship between distance and period (Kepler's Third Law, google it if you want the details) although it wasn't later, until Isaac Newton came around, that gravity was more understood.
What direction would a planet travel if gravity did not affect?
what direction would a planet travel if gravity did not affect? In the same direction as it was traveling when it formed. A body will remain in the same state of motion unless acted upon by a net external force. why does a planet farther from the Sun have longer period of revolution than a planet closer to the Sun? Because the perimeter of a complete orbit is a longer arc-length. how many times farhter from the Sun is Neptune compared to Earth? Look it up at the following, in the sidebar, it indicates "semimajor axis" in units of AU. 1 AU = the approximate Earth-sun average distance. http://en.wikipedia.org/wiki/Neptune please rank the planets from shortest to longest periods of rotation. Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
What is the interpretation of the conjunction between the ascendant, Neptune and Mars in the 1st house of Sagittarius?
MooThat's a very interesting combination. Neptune and Mars would be incorporated into the personality and also into the physical body. Neptune has to do with fluidity, because its water and Mars is heat, because it's a fire sign. Mars is also the physical bodies energy. Usually when I see Neptune and Mars together I can usually expect to see a very graceful fluid body. Since it's in your personality and also in your body, this would lead me to think that you are likely a dancer, and a very graceful one at that. Neptune and Mars together also has to do with your physical energy which would likely be cyclical, meaning that some days you would get up with a lot of Martial energy, and other days you would just for a float out of bed. But the biggest benefit is the gracefulness of your body. Your personality would also be soft and kind, yet with an edge.
What is the easiest way to understand tidal bulges and the types of tides?
The point on Earth which is closest to the Moon is attracted to the Moon a little stronger than Earth as a whole. Consequently there is a net force acting on that point away from Earth center and toward the Moon.Likewise the point on Earth which is farthest from the Moon is attracted to the Moon a little less than Earth as a whole. Consequently, although not quite as intuitive, there is a net force acting on that point away from Earth center and away the Moon. Overall, these forces look like this:In effect, the Moon’s gravity stretches the Earth a little along the Earth-Moon axis; Earth has a similar although much stronger effect on the Moon. If the planet co-rotates with the moon and is faster than moon's revolution (Earth-Moon situation) then the tidal bulge runs ahead of the moon and pulls it forward, thus raising the moon's orbit. Conversely, the moon pulls back on the bulge, slowing down the planet's rotation. That’s why our Moon is receding by something like 4 cm per year.If the moon revolves faster than the planet rotates, and in the same direction (Mars-Phobos situation) then the tidal bulge falls behind the moon and pulls it back. The moon loses energy and drops to lower orbit, while the planet speeds up, as the tidal bulge is being pulled forward. Eventually Phobos will crash into Mars.If the moon revolves counter to planet's rotation (Neptune-Triton situation) then tidal bulge always falls behind the moon. The moon slows down -- and the planet also slows down because the tidal bulge is being pulled backward with respect to planet's rotation. Total angular momentum of the planet-moon system remains the same. Again, one day Triton will crash into Neptune.