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August 25, 2005
Mars Hoax
By now you may have heard that on Saturday Mars will be as big as the full moon. Well, don't believe it. What the typical e-mail says is that "At a modest 75-power magnification Mars will look as large as the full moon to the naked eye." So technically that's correct (although other things in the e-mail are wrong) but misleading—it is 75 times smaller than the Full moon in diameter, 5625 times smaller in area. If Mars were to get so close that its naked-eye size was the same as the Moon's, then its gravity would alter our orbit and that would be a Bad Thing.
Posted by at August 25, 2005 11:23 AM
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Comments
Wouldn't it also do bad things to our tides?
Posted by: Slublog at August 25, 2005 12:56 PM
Depends. If the Moon and Mars lined up at that time, yes. If they were at 90 degrees to each other at that moment, they would largely cancel out, like the Sun and Moon do for neap tides. Haven't figured out yet which would have the stronger pull, Mars or the Moon, if they are at equal apparent diameter.
Posted by: MainiacJoe at August 25, 2005 01:05 PM
Uh...if you are looking at it under 75x magnification, how, uh, can you be said to be looking at it with the naked eye?
Naked eye = nothing in front of it.
75x mag = Telescope in front of it.
Duh?
Posted by: Partisan Pundit at August 25, 2005 09:12 PM
You're asking the wrong guy. I don't get any of it.
Posted by: Slublog at August 25, 2005 09:47 PM
The point is, the e-mail says that undeer 75x magninifation it looks as big as the moon to the naked eye, but every single person who has mentioned the e-mail to me says that Mars will be as big as the Moon and it's obvious they've missed the magnification part. If you read it carefully, it is as you said perfectly clear--but somehow a lot of people are getting it mixed up. I suspect it is much more word of mouth than people actually reading the e-mail.
Posted by: MainiacJoe at August 26, 2005 09:03 AM
so did anybody see mars?
Posted by: lorie at August 27, 2006 08:36 PM
I put this image together for a friend who was asking about the email that was circulating. Keeping in mind that this started circulating in 2003 (which is when the event actually happened) and in August of 2003, Mars was indeed quite close.
If the moon had been full and visible on the night, this is the correct Mars/Moon scale for this "life changing" event.
Moon and Mars image
Posted by: Martian at September 9, 2006 07:42 AM
Well, people probably read the sentence wrong. It should have been read as," At a modest 75-power magnification Mars will look *as large as the full moon to the naked eye*." Not,"At a modest 75-power magnification Mars will look *as large as the full moon* to the naked eye." Booyah, grammar strikes again!
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