what is the diameter of a nebula?
407489
There's no single diameter for all nebula (plural is 'nebulae'). Some are up to 100-light years across, while others might be as small as .5 light years.\n\nhttp://reference.allrefer.com/encyclopedia/N/nebula.html
752656
The size of an object you can resolve with an optical system has a theoretical limit given by the wavelenght of the light you're using divided by the diameter of the optics multiplied by 1.22. If you plug the numbers in you find for a 1 foot diameter optical system at visible light (~400 nm) at an altitude of 100km, the smallest thing you could see is on the order of a foot, give or take (rough calculation). You could definitely not read a postage stamp or a wrist watch. Maybe a license plate with some bigger optics, but this is ignoring all sorts of atmospheric scintillation which screws things up.
338526
diameter x pi\npi=3.14159...\n\nthat's it
110402
A nebula can have any mass.  A planetary nebula typically has a mass from 1 to several solar masses.  Star forming nebulas can have a mass excess of 100 soalr masses.
160871
Divide 34 by PI...that will give you the diameter.\n\nDiameter = Circumference / PI
501741
Pretty close!\nThe "equitorial" diameter = 3,476.2 km\nand the "polar" diameter = 3,472.0 km\nSo, it is a sligtly "oblate" spheroid.\nabout 0.12% from being a "perfect" sphere.
877827
Is that a single diameter?  Your statement is ambiguous.\n\nAssuming that it is, find the distance between those two points.  Halfway between the two points is the center
152097
Different nebula can have different temperatures.  Nebula like the Orion Nebula are really hot because the stars in the center part of the nebula are heating them up to around 10,000 Kelvin.  However, when stars aren't around, nebula can get extremely cold, just a few degrees above absolute zero.\n\nNebula that were formed by exploding stars, such as supernova remnants or planetary nebula, can be even hotter, into the millions of Kelvin.  This is because of the massive amounts of energy that were released in the star's death.
934797
Jupiter has a diameter equal to 11.2 times the diameter of Earth.  In terms of volume, the ratio is 11.2^3 = 1405.
3444
The diameter of the earth at the equator is 7,926.41 miles (12,756.32 kilometers).\nBut, if you measure the earth through the poles the diameter is a bit shorter - 7,901 miles (12,715.43 km). This the earth is a tad wider (25 miles / 41 km) than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
430210
Volume of a shphere  = 4/3 * pi * R^3\n\nwhere pi = 3.142 (approx)\nand R is the radius
184801
about the same size as the sun, it's average in many ways.\nthe diameter of the sun is about 860,000 miles.
286272
Pluto has a diameter of 2306 ± 20 km. Mercury's diameter is 4879.4 km. Also, Mars' diameter is 6,804.9 km. So, Mercury is the planet closest in size to Pluto, judging by diameter.
228115
A Planetary Nebula is a misleading name.  At the end of a lower mass star's life (for stars up to about 8 times the mass of the sun), the star puffs up, and loses the outer layers of gas surrounding it.  All this gas goes out into space where it can be seen as what we call a planetary nebula.\n\nOriginally the word "nebula" was applied to any astronomical object that was not a star or a memeber of our solar system (planets, asteroids etc), the word essentially means "cloud."\n\nAs telescopes got better people started to find many different types of nebulae. A Spiral Nebula looks like, well a spiral, today we know that these are spiral galaxies.  Planetary Nebula were named because the looked round, and a number of them had the same greenish color that Uranus had been seen to have by Hershel.
408251
Measure the diameter and multiply by pi (3.1415)
41352
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)
791771
Equatorial diameter = 12,756.2 km\nPolar diameter = 12,713.6 km\nVolumetric mean diameter = 12,742.0 km\n\n(BTW there is no such thing as centrifugal force, it's an engineers' myth; there is only inertia.)  :)