what is it called when all nine planets are in alignment?
470500
Conjunction is with any number of planets or planets and the sun. (Obviously three things need to line up at least).\n\nI don't think all 9 planets lined up last may but it was an impressive number, like 5.  But I don't know for sure.\n\nAlso you want to remember that even if all 9 line up, they wouldn't form an exactly straight line because their orbital planes are all tilted slightly differently from one another.
843396
In 1968 Ragni and Rado's hippy musical Hair featured the following lyrics:\n\n"When the Moon is in the Seventh House\nAnd Jupiter aligns with Mars\nThen peace will guide the planets\nAnd love will steer the stars\n\nThis is the dawning of the Age of Aquarius\nThe Age of Aquarius\nAquarius!\nAquarius!"\n\nAs is implied by these lyrics, Jupiter and Mars aren't always aligned. They move into alignment and out of it again, Their years are of different lengths (Mars 1.88 Earth years and Jupiter 11.86 Earth years)\n\nFor a simple picture (ignoring the fact the orbits are ellipses), the radius of Jupiter's orbit is 5 AU and the radius of Mars' orbit is 1,5 AU.\n\nTheir mutual separation can vary widely e.g. when they are both on the same side of the sun, ir can be as little as 3.5 AU, when they are 180 degrees away from one another in their orbits, with the Sun inbetween them, it is more like 6.5 AU.\n\nBut the fact that the orbits are not circular but elliptical will make it more complicated as the question of whether the planets are at aphelion (the furthest they get from the Sun) or at perihelion (the nearest they get to the Sun) becomes highly relevant.\n\nIf Mars is at aphelion when Jupiter is at perihelion that will produce the minimum Mars-Jupiter seoparation at alignment and conversely if Mars were to be at perihelion and Jupiter at aphelion, that will produce the maximum Mars-Jupiter separation at alignment,\n\nHere are the figures;\n\nJupiter: Perihelion: 4.951 AU. Aphelion: 5.455 AU.\nMars: Perihelion: 1.381 AU. Aphelion: 1.665 AU\n\nWhich gives us a minimum  Mars-Jupiter distance at alignment of 4.951 - 1,665 AU = 3.286 AU.\n\nAnd gives us a maximum  Mars-Jupiter distance at alignment of 5.455 - 1,381 AU = 4.074 AU.\n\nWhen they are 180 degrees away from one another with the Sun directly between them ... it is a matter of adding the perihelion distances for the closest they can be and adding the aphelion distances for the furthest they can get from one another.\n\nWhich gives us a minimum  Mars-Jupiter distance when 180 degrees apart of 4.951 + 1,381 AU = 6.332 AU.\n\nAnd gives us a maximum  Mars-Jupiter distance when 180 degrees apart of 5.455 + 1,665 AU  = 7.120 AU.
58584
All the planets in our solar system
258603
maybe you wanted to write 10th planet, not 11th planet.\n\nmaybe there was such a thing but i don't see any records of it on nasa-s site.\n\nWhat i do see is the report of the 10-th planet being discovered, maybe that's what u  were reffering to.\n\nhere's the link\n\nhttp://science.nasa.gov/headlines/y2005/29jul_planetx.htm
413268
Mercury, Venus, Mars, Jupiter, and Saturn.
375210
Mountains, bodies of water and seasonal tilt in the earths axis. That's the whole 9 yeards.
1097603
The order of planets? \n\nMercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto
57630
No.\n\nThe orbits are inclined slightly and I do not believe there is a place where they would all be *exacly* in a line.\n\nBut they get close together in the sky. The visible planets are within a couple of degrees every twenty or thirty years. (Holding your fist out will block about 10 degrees.) Such an alignment in the sky can last for a few days.
556954
there are nine planets in the solar system. it is not know yet how many planets are there in the entire universe, because we just know about 3 galaxies (and still do not know about any planets in galaxies other than the milky way)
120361
As the motto of The Planetary Geology Division of the Geological Society of America says, ""When one planet simply isn't enough."\n\nSo my vote would be for "planetary geology".  :)
307741
Right now there are officially 9.  Depending on what we decide in the next year or so that number will change to 8, stay 9, go to 10, or even larger.  An object larger than Pluto has been found, but we have not granted it official status as a planet.  Don't expect this issue to be resolved any time soon, we've more or less "tabled" the issue until our general meeting in August.
966439
Not precisely, but that gives a very good first approximation. The planets generally orbit the Sun in the plane of the Solar equator, which is what you would expect. There are variations, most notably that of Neptune, (and until it was demoted to "dwarf planet", Pluto.\n\nThe plane of the Solar equator is inclined to the plane of the Earth's equator by approx. 7 degrees, and this means that the sun, and all the planets, follow this path, which is called the "ecliptic".It gets that name because the apparent path of the moon crosses the ecliptic at two points, called nodes, and it is when the moon and sun are both at or very near one of these nodes in their apparent motion that an eclipse, either solar or lunar, occurs.
368925
Other planets since all nine planets revolve around the sun so when you're on one side of the sun,other planets are probably on the other side!
423611
an alignment of more than 2 planets is not a frequent occurrence.  on 21 Dec 2012, mercury, venus and saturn lie roughly along a line, but the rest of the planets are not even close to that line.\n\nthe link below -- to the "bad astronomy" website -- concerns the last time there was something close to a "line-up" of the planets and a thorough analysis of its (lack of) effects.  the second link gives a more thorough look at how often "line-ups" occur.  basically, the time needed for an exact line-up to happen is about every 340 million years for all planets excluding the earth, and every 180 trillion years (or more than 10,000 times more than the current accepted value for the age of the universe) if you include the earth being on the same side of the sun and lying on a line with all other planets.\n\nalso, the "age of aquarius" has nothing to do with planetary alignment, but refers to the motion of the point of the vernal equinox in the sky relative to the zodiac constellations as caused by the precession of the earth's poles.  in roughly 600 years, this point will pass from pisces into aquarius.
600203
NINE, I think senda is not the 10th planet (because of its small size). Nine planets are:\n\nMercury(Roman god of thieves)\nVenus(God of beauty)\nEarth\nMars(God of War)\nJupiter(Supreme Roman god)\nSaturn(God of agriculture)\nUranus(Ruler of the heavens, father of the Titans\nNeptune(God of the sea)\nPluto.
828916
8 - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.  Almost assurdly there are no more big ones.  There are also a class of planets called "dwarf planets", including Pluto and a couple of others.
679895
mercury, mars, venus, earth, jupiter, saturn, uranus, pluto and neptune.