What is the average radius of the Solar System's heliopause?
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A NASA site states:\n"The heliopause has never been reached by any spacecraft; the Voyagers may be the first to pass through this region, which is thought to exist somewhere from 8 to 14 billion miles from the Sun. Sometime in the next 5 years, the two spacecraft should cross an area known as the termination shock. This is where the million-mile-per-hour solar winds slows to about 250,000 miles per hour—the first indication that the wind is nearing the heliopause. The Voyagers should cross the heliopause 10 to 20 years after reaching the termination shock."\n\nAlso check APOD 2002 June 24  (APOD = Astronomy Picture Of the Day).  Their best guess is 110 AU (Astronomical Units; 1 AU is the average Sun-Earth distance), in the direction of the apex -- this would make it the shortest distance.\n\nYou ask for average distance.  Using their drawing (if it is to scale) the trailing end of the heliopause appears 7 times further than the front end.  Thus the average is 4 times  (seven plus one, the sum divided by two): 440 AU.\n\nAs the previous person said:  this is a guess.  It is based on an educated guess for the front end (NASA), and a relatively well thought out drawing that, maybe, could represent the quasi-ellipsoidal form of the heliopause surface.\n\nA mile is 1.6 km (8 billion miles is 12.8 x 10^9 km)
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Yes, in a couple of billion years, the Sun will exhaust most of its hydrogen and enter the Red Giant Phase, its radius will be equal to that of the orbit of Mars. \n\nAstronomical calculations are proof.
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Distance From Sun is: 93,000,000 Miles
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orbit:    57,910,000 km (0.38 AU) from Sun\n        diameter: 4,880 km\n        mass:     3.30e23 kg\nMercury is the innermost and smallest planet in the solar system, orbiting the Sun once every 88 days. It ranges in brightness from about −2.0 to 5.5 in apparent magnitude, but is not easily seen — its greatest angular separation from the Sun (greatest elongation) is only 28.3° (it can only be seen in twilight). Comparatively little is known about the planet: the only spacecraft to approach Mercury was Mariner 10 from 1974 to 1975, which mapped only 40%–45% of the planet's surface.\n\nPhysically, Mercury is similar in appearance to the Moon as it is heavily cratered. It has no natural satellites and no substantial atmosphere. The planet has a large iron core which generates a magnetic field about 1% as strong as that of the Earth. Surface temperatures on Mercury range from about 90 to 700 K (-180 to 430°C) , with the subsolar point being the hottest and the bottoms of craters near the poles being the coldest.\n\nThe Romans named the planet after the fleet-footed messenger god Mercury, probably for its fast apparent motion in the twilight sky. The astronomical symbol for Mercury, displayed at the top of the infobox, is a stylized version of the god's head and winged hat atop his caduceus, an ancient astrological symbol. Before the 5th century BC, Greek astronomers believed the planet to be two separate objects: one visible only at sunrise, the other only at sunset. In India, the planet was named Budha (बुध), after the son of Chandra (the Moon). The Chinese, Korean, Japanese, and Vietnamese cultures refer to the planet as the water star, based on the Five Elements. The Hebrews named it Kokhav Hamah (כוכב חמה), "the star of the hot one" ("the hot one" being the Sun).
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well, i'll answer your questions in reverse order.\n\nneptune's average distance from the sun is about 4.5 billion kilometers, or about 30 times as far out as the earth.  it has a diameter of around 50,000 kilometers, which means it's about 4 times the size of the earth.\n\nas for how long it would take - that entirely depends on what kind of spaceship you used to get there.  if you had a fictional spacecraft that could go nearly the speed of light, it would take around 3 hours.  if you used the same kind of spacecraft that the apollo missions used, you would be traveling around 25,000 MPH.  this is around 40,000 kilometers per hour, so:\n\n4.5 billion kilometers / 40,000 kilometers per hour = 112500 hours = 13 years or so.
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That is a really intersting question.\n\nI'm pretty sure atoms are more spaced... let's find out!\n\nSolar system in km\n\nPlanets in our solar system (diameter)- About 4880 Merc (I hate pluto and refuse to call it a planet) to 142,984 Jupt\nSun- 1.392*10^6km\nSun to planets distance (semimajor axis) - from 5.79*10^7 km to 4.5017*10^9 km\n\nDistance to planet size ratio -\nBig planet farthest - 31,483.94 (it's about 30,000 planet lengths)\nSmall planet closer - 11,864.75 (it's about 12,000 planet lengths)\nDisance (half way point) to sun size ratio - 1,637.79 (it's about 1,500 star lengths)\n\n\nHydrogen atoms in pm (pico meter)\n\nAn electron: 10^(-6)pm\nH nucleus - .01 pm\nSize of H atom (distance apprx) - 250 pm\n\nDistance to electron size ratio:\n2.5*10^(8) (it's a hell of a lot of electron lengths)\n2.5*10^(4) (it's about 25,000 neucleus lengths)\n\nSo there is much more space in an electron... the distance compared to the size of things is on a much higher order.  Plus we must remember that I used the smallest atom (others would have other shells of electrons a little further out but slightly bigger nuclei as well) and I used our solar system... other solar systems we have detected have big planets much closer to their stars.  Perhaps the electron's distances  more comperable to the distances between galaxies???  Wild guess.  My... calculator is too tired to figure it out. haha
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It depends on the season. The current average lengths are:\nWinter: 88.994 days\nSpring: 92.758 days\nSummer: 93.651 days\nAutumn: 89.842 days \n\n(These values change slowly over time, as the position of the perihelion of Earth's orbit changes.)\n\nThe differing lengths of the season enabled ancient Greek astronomers to accurately measure the eccentricity of Earth's orbit as far back as the 2nd century BC.
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Here's a whole lot about the planet closest to the Sun in the Solar System:
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Thats why they asked theoretically.\n\nsame radius as the solar system\n1267650600228229401496703205376 kms\n\nOf which you allready knew, otherwise u would not be asking
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Mars.  And it's diameter is 4,220 miles.
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the average distance between the Earth and the Sun (approximately 150 million km or 93 million miles).
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8.8 AU....or 868 million miles from the sun.
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Jupiter is the largest planet in the solar system. Its diameter is 88,846 miles (142,984 kilometers), more than 11 times that of Earth, and about one-tenth that of the sun. It would take more than 1,000 Earths to fill up the volume of the giant planet. When viewed from Earth, Jupiter appears brighter than most stars. It is usually the second brightest planet -- after Venus.\n\nJupiter is the fifth planet from the sun. Its mean (average) distance from the sun is about 483,780,000 miles (778,570,000 kilometers), more than five times Earth's distance. Ancient astronomers named Jupiter after the king of the Roman gods.\n\nAstronomers have studied Jupiter with telescopes based on Earth and aboard artificial satellites in orbit around Earth. In addition, the United States has sent six space probes (crewless exploratory craft) to Jupiter.\n\nAstronomers witnessed a spectacular event in July 1994, when 21 fragments of a comet named Shoemaker-Levy 9 crashed into Jupiter's atmosphere. The impacts caused tremendous explosions, some scattering debris over areas larger than the diameter of Earth.\n\nPhysical features of Jupiter\n\nJupiter is a giant ball of gas and liquid with little, if any, solid surface. Instead, the planet's surface is composed of dense red, brown, yellow, and white clouds. The clouds are arranged in light-colored areas called zones and darker regions called belts that circle the planet parallel to the equator.\n\nOrbit and rotation\n\nJupiter travels around the sun in a slightly elliptical (oval-shaped) orbit. The planet completes one orbit in 4,333 Earth days, or almost 12 Earth years.\n\nAs Jupiter orbits the sun, the planet rotates on its axis, an imaginary line through its center. The axis is tilted about 3¡. Scientists measure tilt relative to a line at a right angle to the orbital plane, an imaginary surface touching all points of the orbit.\n\nJupiter rotates faster than any other planet. It takes 9 hours 56 minutes to spin around once on its axis, compared with 24 hours for Earth. Scientists cannot measure the rotation of the interior of the giant planet directly, so they have calculated the speed from indirect measurements. They first calculated the speed using an average of the speeds of the visible clouds that move with interior currents, except for a more rapid zone near the equator.\n\nJupiter sends out radio waves strong enough to be picked up by radio telescopes on Earth. Scientists now measure these waves to calculate Jupiter's rotational speed. The strength of the waves varies under the influence of Jupiter's magnetic field in a pattern that repeats every 9 hours 56 minutes. Because the magnetic field originates in Jupiter's core, this variation shows how fast the plant's interior spins.\n\nJupiter's rapid rotation makes it bulge at the equator and flatten at the poles. The planet's diameter is about 7 percent larger at the equator than at the poles.\n\nMass and density\n\nJupiter is heavier than any other planet. Its mass (quantity of matter) is 318 times larger than that of Earth. Although Jupiter has a large mass, it has a relatively low density. Its density averages 1.33 grams per cubic centimeter, slightly more than the density of water. The density of Jupiter is about 1/4 that of Earth. Because of Jupiter's low density, astronomers believe that the planet consists primarily of hydrogen and helium, the lightest elements. Earth, on the other hand, is made up chiefly of metals and rock. Jupiter's mix of chemical elements resembles that of the sun, rather than that of Earth.\n\nJupiter may have a core made up of heavy elements. The core may be of about the same chemical composition as Earth, but 20 or 30 times more massive.\n\nThe force of gravity at the surface of Jupiter is up to 2.4 times stronger than on Earth. Thus, an object that weighs 100 pounds on Earth would weigh as much as 240 pounds on Jupiter.\n\nThe atmosphere of Jupiter is composed of abou
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Well, the diameter of the planet is 12,756.3 km.  That would make the radius approximately 6,378 km.  So the radius shoud be an approximation of the distance between the inner core and the surface.\n\nAh ha!  I just look it up and I was right! "Inner core (5000 km - 6370 km below the Earth's surface)."\n:o)
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Usually Astronomical Units (AU's). \n\n1 AU is the mean distance of Earth from the sun.\n\n1AU = 92,955,800 miles\n\nMercury = .39 AU\nVenus = .72 AU\nEarth = 1 AU (of course)\nMars = 1.52 AU\nJupiter = 5.2 AU\nSaturn = 9.54 AU\nUranus = 19.18 AU\nNeptune = 30.06 AU
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First: we are constantly being bombarded by millions of asteroids. The only thing that saves us is the atmosphere, which vaporizes them.\n\nI'll do a little math. We'll consider the solar system to end after the Oort Cloud, 100,000 AU or 9,300,000,000,000 miles. Therefore, the solar system has a volume of 4/3*π*(9.3*10^12)^3, or ........ about 3.369*10^39 cubic miles. The Earth has a volume of about 2.08*10^12 cubic miles.\n\nIn short, the Earth takes up 0.00000000000000000000000006% of the solar system. Even with trillions of potential threats, the chances are next to nothing.
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Acording to Kepler's first law of planetary motion, all objects obit other objects in eliptical paths.  This means that the distance from the earth to the sun is not constant.  The average distance is 149600 km or 92 957.1304 miles.  This means that it would take 1239.42 hours or 51 Days 15 hours.