what does mercury moving accross the sun mean today?
830416
it means that  the mercurys orbit as seen from the earth is currently crossing the path of the sun.\n\nthink of it as just another eclipse. only mercury is too small and too far away to block much of the light from the sun\n\nthere is no signigicance. it happens at regualr intervals. it is just a neat thing to see.
1094061
Earth is revolving in orbit, held in place by the Sun's gravitational pull
115618
I believe mercury has it.
650314
earth to the sun is 93 million miles and the distance from mercury to the sun is about 36 million miles. so 93-36= about 57 million miles. hope this helps.
181847
Because planets are actually moving in relation to stars.  They are orbiting the sun.  They are also a lot closer to us than stars.  For example, when you drive, you see mountains in the distance.  You are passing those mountains at 65 miles an hour.  They appear to be going by very slowly.  But when you pass a light pole right next to you at the same speed, it appears to whizz by really fast even though it's the same speed.
1066767
According to astrologists, Mercury in Retrograde is a time to slow down and reflect on recent events/happenings.  They also say do not sign contracts during this time or make any huge decisions while Mercury is in Retrograde and  that problems with technical tools will arise.
680884
Solar wind reaches all of the planets in varying degrees. Flares most likely do not reach Mercury.
337086
The planets are actually trying to move in a straight line at a high speed due to the intertia from some force long ago.  When two objects are moving by each other, their gravity interacts and pulls them toward each other, bending the path that would otherwise be a straight line.  If they are too massive and too close, the gravity pulls them so much that they collide.  If things are balanced just right, the path is bent into a complete ellipse.  It's an ellipse instead of a circle because the sun is actually also being pulled a tiny bit toward the earth, as well.\n\nYou could consider gravity to be sort of a "perpendicular inertia", and the planets would revolve around the sun FOREVER if there were no other forces involved.
582015
Mercury has a very miniscule atmosphere (about two trillionths the pressure of earth's atmosphere) which consists of hydrogen and helium. Because the atmosphere is so thin, the sky is black.\n\nBecause mercury has no tilt, there are no seasons. It takes about 88 earth days to orbit the sun, and rotates very slowly (taking about 60 earth days). The temperature ranges from -168 degrees C at night, to +427 degrees C during the day. As the atmosphere is so weak (and almost non-existent), there is no greenhouse effect to retain the heat - hence the temperature quickly drops during the long slow night.\n\nFrom the surface of Mercury, the sun would appear to be three times bigger than it is on earth.\n\nVenus, being further away from the sun than Mercury, is even hotter - with a daytime temperature of 475 degrees C - due to the greenhouse effect.
972227
right now, like today? or the week? cause you know, that changes around. For today it was scorpio till noon, then entered in sagittarius.
679561
Earth and all the planets in out solar system are orbiting our Sun. The Sun and all stars are moving in space, but those other stars are not moving around US; they are orbiting the center of the Milky Way galaxy. Because the stars are so far away from us it takes thousands of years before they have moved far enough for us to notice it from so far away, but astronomers have made careful measurements with telescopes and can detect small position changes, which they call "proper motion". I googled "proper motion" and below is the first result.
980127
Only three major Solar System bodies move in orbits that carry them between the Earth and the Sun - the Moon and the planets Mercury and Venus. In the case of Mercury, transits occur either close to 7 May at intervals of 13 and 46 years or close to 9 November, which occur more frequently at intervals of 7, 13 and 46 years. \n\nTransits occur between three and 13 years apart, with November transits occurring at nearly double the frequency of those in May. The next transit of Mercury visible from the British Isles will be on 9 May 2016, but on that occasion we will only see the early stages before sunset.
994578
Technically, it is ... just slowly ... the orbits that the planets make around the sun are actually the planets spiralling inward toward the sun ... they will collide with the sun eventually.
935922
F=GMm/r^2. The M and m stay the same, but r changes. Which one gives the smaller r (and hence the larger force)? If you assume a circular orbit, then the answer is clearly noon today. However, the orbit is not a circle, it is an ellipse. There are certainly days when you are closer at midnight than at noon the previous day, but if that happens, the earth is getting closer to the sun in its orbit. Today, however, the earth is actually moving away from the sun, so noon is still the correct answer. In May, the answer would be midnight.
262658
The orbit of Mercury describes roughly a circle.  If the gravitational attraction of the sun instantly disappeared (a mental exercise) Mercury would fly off into space on a straight line tangent with the circle and at the instantaneous velocity it had at the instant of departure.  It does not fly off into space solely because it is always falling toward the sun at the correct rate to keep it on the circle.\n\nAs such, Mercury has kinetic energy (of motion) equal to one half times its mass times its velocity squared which is an enormous amount of energy.  To move mercury using solar energy you likely would likely have to collect a substantial part of the solar wind and direct in onto Mercury (without burning it!).  To Move mercury to a higher orbit you would need to accelerate it in a direction always tangential with its orbit to increase its kinetic energy.  To make an ititial estimate of the energy needed, I'd suggest using what I call a "technical tithe" or 10% of what you wish to change.  For example if you have 100 pounds twins balanced on a seesaw and hand one a 10 pound weight it should noticeably change the balance whereas a few grams nay not be noticed.  Therefore, calculate 10% of Mercury's kinetic energy and that is about the amount you may have to add to make a significant change.  That will require a huge force even if exerted constantly over a long period of time to reach the calculated amount of added energy.  Good luck.
1150795
occasionally, mercury and venus do individually come between the earth and sun, but i have never heard that they have both been there at the same time.\n\nlook here for venus\nhttp://skyandtelescope.com/printable/news/article_1279.asp\n\nlook here for mercury\nhttp://skyandtelescope.com/printable/observing/objects/planets/article_953.asp
227558
None.  We have had a fly-by, but no orbiters.  Messenger will eventually be there, but it is rather hard to orbit mercury.  You launch a probe to it, and you need to be pretty craft to be able to stop it at mercury since it will have a tendancy to be accellerated into the sun.