in earth years how long would it take to cross the milkyway galaxy?
958242
Taking the milky-way galaxy to be approx 100 000 ly across, and travelling at a realistic speed of 5 000 km/h, it would take just under 200 000 billion earth years to traverse the galaxy end to end.
297501
I'm sure you are spekaing strictly hypothetically, but don't forget the closer you get to the speed of light (c), the slower time moves around you.  So if you were to go like 90% of c for 1 year, more than 1 year would pass for everyone else.
657143
DRFUN96...he da man!\n\nGood thing Yahoo Answers doesn't subtract points for wrong answers or most of the people who "answered" this question would be in the minus numbers. Maybe this is where the saying "Ignorance is bliss" came from.\n\nOur sun is moving around (orbiting) the Milky Way Galaxy at some 560,000 miles per hour. One orbit takes about 226-million years.
15135
well, i'll answer your questions in reverse order.\n\nneptune's average distance from the sun is about 4.5 billion kilometers, or about 30 times as far out as the earth.  it has a diameter of around 50,000 kilometers, which means it's about 4 times the size of the earth.\n\nas for how long it would take - that entirely depends on what kind of spaceship you used to get there.  if you had a fictional spacecraft that could go nearly the speed of light, it would take around 3 hours.  if you used the same kind of spacecraft that the apollo missions used, you would be traveling around 25,000 MPH.  this is around 40,000 kilometers per hour, so:\n\n4.5 billion kilometers / 40,000 kilometers per hour = 112500 hours = 13 years or so.
1167972
It actually depends on how far Mars is from Earth at the time you decide to travel. According to http://www.uwgb.edu/dutchs/planets/mars.htm \n\nThe Earth-Mars distance varies between 36 million miles and 250 million miles. That means that your travel time would range from 450000 hours (51 years) to 3125000 hours (357 years)\n\nNote that this estimation does not take into account the fact that Earth and Mars are continually in motion. If, as you drive, you are constantly pointing towards Mars, you wont be moving in a straight line, and the time of travel will be much longer. In order for the above estimations to hold, one would need to try to intercept Mars' trajectory...
1178302
Mean distance from earth149.6×10^6 km or (92.95×10^6 mi)\nIt would take about 8.31 minutes at the speed of light to go from earth to sun.
587733
Light travels at 186,282 miles per second.  So multiply by 60 (seconds per minute) by 60 (minutes per hour) by 24 (hours per day) by 365 (days per year), which gives 5,874,589,152,000 miles for 1 light year.\n4.2 light years works out to 24,673,274,438,400 miles.  Quite a long walk :) \nHere's a way of illustrating this:\nIt takes light 1.27 seconds to travel the 238,000 miles from the Earth to the Moon.  If this distance is represented by 1.27 inches, then an object one light year away would be 636 miles away, and a star 4.2 light years distant would be 2,670 miles away - about 200 miles more than from New York to Los Angeles!
577859
Someone just added an extra "e" in it.\n\nOur Solar System is in a Galaxy called the Milky Way. The Milky Way comprises stars and other material lying within a galactic plane. Relative to the celestial equator, the Milky Way passes as far north as the constellation of Cassiopeia and as far south as the constellation of Crux, indicating the high inclination of Earth's equatorial plane and the plane of the ecliptic relative to the galactic plane.\n\nThe fact that the Milky Way divides the night sky into two roughly equal hemispheres indicates that the solar system lies close to the galactic plane.\n\nThe main disk of the Milky Way Galaxy is about 80,000 to 100,000 light years in diameter, about 250-300 thousand light years in circumference, and outside the Galactic core, about 1,000 light years in thickness. It is composed of 200 to 400 billion stars.
621324
Around 105 light years, or 3x10^5 km/s * 365 * 24 * 3600s * 105 km, or 993 384 000 000 000 km, or 617 277 076 989 996 mi
604274
It takes light 8 minutes (plus or minus seconds) to travel from the Sun to the Earth. So if the sun 'Died' this second, it will take 8 minutes till we know about it, i.e. the lights go out and the heating is turned off.\n\nHopefully we will still have the stars and moon to merrily sooth us into our freezing tombs.
1174698
16 min approx by light\n250,000 hours by jet\n2 million hours approx by fast car\n80 million hours by foot\n\n150 Tm from earth (150 million km)
1023043
At the same moment exactly 1 year later the Earth will be (relative to the sun), in exactly the same place.  However, Earth and the rest of our solar system are also located in an outer arm(called the Orion arm) of our Milky Way galaxy which is rotating, so Earth is also travelling 155.25 miles per second around our galaxy.  In addition, our galaxy is a part of a large group of galaxies and so Earth is moving 114.885 miles per second relative to these galaxies.  And finally Earth, along with the solar system, our own galaxy and the local group of galaxies is moving through the Universe at a speed of 370 miles per second.
324819
It depends on the altitude of the orbit.  At a typical LEO (Low Earth Orbit), the typical time would be around 80 to 90 minutes.  At GEO (Geostationary Orbit) (22,800 miles high) it takes exactly one day, which is why communication satellites over the equator always remain over the same spot of the Earth.
1054714
if we travel at the speed of light, it would take approximately 4.2 years to travel to Proxima Centauri.  Obviuosly, we can't reach that speed.  Space Shuttles can reach a speed of 17,500 mph or 7823.2 m/s.  With this speed, it would take 161059.4 yrs
323083
The Sun is rotating aroun the centre of the Milky Way and heading in the direction of Alpha Hercules at the speed of 150 miles a second.\n\nMakes Roger Bannister's sub-4-minute mile look rather slow doesn't it?
687280
Not counting the sun, the closest star to earth is Proxima Centauri, which is about 4.1 light years away from the earth. Light travels at 300 000 km/s so you can now use this to calculate the distant. 4.1 light years x 365 days per one light year x 12 months per 1 year x 30 days per one month, x 24 hours per one day x 60 minutes per one hour x 60 seconds per one minute = 4,654,713,600 seconds. Multiply this figure by 300 000 km/s and you get an answer of 1,396,414,080,000,000 Kilometers.
194179
The distance from the earth to the sun is about 93 million miles. The speed of light is about 186,000 miles per second. Dividing shows that it tkes light about 500 seconds to go from the sun to the earth. That's 8 minutes 20 seconds.