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Originally posted by Illustronic
Gravity emanates from the center of a mass, and never becomes totally absent, yes gravity travels forever. If there were only 2 objects in the Universe, they would eventually collide, due to gravity, no matter how far away they might be.
Originally posted by Illustronic
reply to post by -PLB-
Look at that JUNO trajectory again, without that in-flight maneuver, JUNO would have remained in solar orbit entirely independent of the earth. The in-flight maneuver guided (will guide) JUNO back to a close flyby of earth, for a speed boost via the slingshot effect, since JUNO is catching up to earth it is already at earth escape velocity and wont get recaptured. We know earth is traveling about 66,600 mph around the sun so JUNO is already going a healthy clip as it reproaches earth.
For an actual escape orbit a spacecraft is first placed in low Earth orbit (160–2,000 km) and then accelerated to the escape velocity at that altitude, which is a little less — about 10.9 km/s. The required change in speed, however, is far less because from a low Earth orbit the spacecraft already has a speed of approximately 8 km/s.
Originally posted by CLPrime
Anything less than 42 sends the projectile into the Sun,
The escape velocity from the Earth's surface is about 11 km/s, but that is insufficient to send the body an infinite distance because of the gravitational pull of the Sun. To escape the solar system from a location at a distance from the Sun equal to the distance Sun-Earth, but not close to the Earth, requires around 42 km/s velocity, but there will be "part credit" for the Earth's orbital velocity for spacecraft launched from Earth, if their further acceleration (due to the propulsion system) carries them in the same direction as Earth travels in its orbit.
Originally posted by CLPrime
reply to post by -PLB-
Here's what Wiki has to say about this:
The escape velocity from the Earth's surface is about 11 km/s, but that is insufficient to send the body an infinite distance because of the gravitational pull of the Sun. To escape the solar system from a location at a distance from the Sun equal to the distance Sun-Earth, but not close to the Earth, requires around 42 km/s velocity, but there will be "part credit" for the Earth's orbital velocity for spacecraft launched from Earth, if their further acceleration (due to the propulsion system) carries them in the same direction as Earth travels in its orbit.
From here: Orbital Mechanics - Escape Velocity.
Aaaaannnnnddd you should check out this: Orbits. Especially the 3rd, 4th, and 5th paragraphs.edit on 17-3-2012 by CLPrime because: (no reason given)
As of February 08, 2012Important Topic Updates
, Voyager 1 is about 120.06973 astronomical units (1.7962176×1010 km) from the Earth and about 119.70479 astronomical units (1.7907582×1010 km) from the Sun.[24] The magnitude of the Sun from Voyager 1 is −16.4, or the dimmest as seen from any of the five space probes leaving the Solar System. Radio signals traveling at the speed of light between Voyager 1 and Earth take 16.5 hours to cross the distance between the two. (To compare, Proxima Centauri, the closest star to our Sun, is about 4.2 light-years distant or 2.65×105 AU.) Voyager 1's current relative velocity to the sun is 17,060 m/s (61,400 km/h; 38,200 mph). This calculates as 3.599 AU per year, about 10% faster than Voyager 2. At this velocity, 73,600 years would pass before reaching the nearest star, Proxima Centauri, were the spacecraft traveling in the direction of that star. Voyager 1 will need about 14,000 years at its current velocity to travel one light year, therefore 40,000 years will pass before coming anywhere near other stars or planets. Voyager 1 is predicted to enter the interstellar medium between 2012–15, though some scientists say it will be in 2014. Voyager 1 is still the farthest man made object in the universe from Earth.
Voyager 1 is not heading towards any particular star, but in about 40,000 years it will pass within 1.6 light years of the star AC+79 3888, which is at present in the constellation Camelopardalis. That star is generally moving towards our Solar System at about 119 km/s (430,000 km/h; 270,000 mph).[25].
work horse
They are'nt made like that anymore extra DIV