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*To*: Brian Mansur <bmansur@oc.edu>*Subject*: Re: MARS HYBRID DESIGN II (First Draft)*From*: David@interworld.com (David Levine)*Date*: Tue, 05 Mar 1996 11:34:21 -0500*CC*: Kelly Starks x7066 MS 10-39 <kgstar@most.fw.hac.com>, hous0042 <hous0042@maroon.tc.umn.edu>, KellySt <KellySt@aol.com>, lparker <lparker@destin.gulfnet.com>, rddesign <rddesign@wolfenet.com>, Steve VanDevender <stevev@efn.org>, "T.L.G.vanderLinden" <T.L.G.vanderLinden@student.utwente.nl>*Organization*: InterWorld, Really Cool Stuff Division*References*: <313C8628@mainpobox.oc.edu>

Brian Mansur wrote: > > Brian 10:15 CT 3/5/96 > > >Kelly Starks x7066 MS 10-39 wrote: > > Pluto moves MUCH faster than Earth. Your mirror would quickly move out of > > the beam. even if the beam was larger than Earths orbit. > > >David > >Pluto's mean orbital velocity is 4.74 km/sec. > >Earth's mean orbital velocity is 29.79 km/sec. > > Why is the mean orbital velocity of Pluto 4.74 compared to a much larger > 29.79. Did you get the numbers mixed up. I'm confused. Nope, you can even do the math yourself. I got the numbers from the LANL solar system web site, though. Let's see if we can do this ourselves: Earth orbits at around 148,800,000 km from the sun, right? That's a circumference of 934,937,974 km. It does this in around 365.25 days, or 31,557,600 seconds. That gives us 29.63 km/sec. Pretty close to the LANL value. I assumed it was a perfect circle, and it's not. Okay, now let's try Pluto. It orbits at 5,913,520,000 km (around 39.74 AU). It revolves around the sun once every 248.54 years, or 7,843,325,904 seconds. The circumference of Pluto's orbit is 37,155,741,978 km. That gives us 4.74 km/sec. Wow, dead on to LANL's value. I must say I'm impressed, especially considering the eccentricity of Pluto's orbit. I assume the mean distance value is for an "equivalent circle". That would explain the accuracy of my results. David

**References**:**Re: MARS HYBRID DESIGN II (First Draft)***From:*Brian Mansur <bmansur@oc.edu>

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