what's the speed of earth in space?

Answer 1

Nobody knows. We are moving relative to the sun, the sun is moving relative to the Milky Way galaxy, and the Milky Way galaxy could be moving for all we know. Any reference we use to base our speed from could be moving, hence it is impossible to tell.

Einstein's theory says all motion is relative. Take our speed relative to the sun, add it to the sun's speed relative to the Milky Way, and add that to whatever speed the Milky Way might be travelling at. Now, if you could add all of the speeds together until you somehow found a stationary reference to base your motion off of, you would have our real velocity. But we have no idea what it is, because we do not know the velocity of our point of reference. Add them together and we could be standing still for all we know. It makes no difference from a relative point of view.

Answer 2

Learn how to use a search engine and then look up the mean radius of the Earths orbit on the internet. The distance that the Earth travels around the Sun is then 2πr where r is the mean radius. Convert this number to meters. This is the number of meters that the Earth travels around the Sun in a year.

Next, convert 365.25 days (the period of the Earths orbit around the Sun) into seconds. Divide the number of meters that the Earth has travelled (the first number you computed) by this number of seconds and you will have the average speed of the Earth around the Sun in meters per second.

There are other numbers that can be added in. The average speed of the Solar system around the center of the Milky way galaxy and the average velocity of the Milky way itself come to mind. And I'm sure with your new found skills with a search engine you can get those as well ☺


Doug

Answer 3

This is really a tricky question because? Had you asked the speed of earth around the sun then it is 67,000 miles per hour and the speed of it's revolution about it's own axis then it is approximately 1000miles per hour....
But you have asked what is the speed of the Earth in the Universe... We know that the Universe is constantly expanding and we never know whether the Universe is moving or not?? If it moving then at what speed does it move?? If the universe moves at a certain speed then at what speed does our galaxy Milky way move??
If we could find the answer to all this question then may be we may be able to find out the speed of the earth relative to the universe, until then your question cannot be answered...

Answer 4

since the Earth follows the Sun, and the sun is travelling at 12 miles per second (!) throught the galaxy, the speed of the earth in realtion to the galaxy is 12 miles per second

Answer 5

OK, here is a rough estimate, using a circular orbit around the sun (it's really elliptical)

The earth is ~93M (million) miles from the sun (r).
It's path around the sun is the circumference of that circle, 2r(pi).
2 X 93M miles X 3.14 = 584M miles

It takes the earth one year to complete a single orbit.
365 days X 24 hours per day = 8760 hours
584M miles / 8760 hours = 66,667 miles per hour.

Answer 6

Speed needs to be measured relative to something. Without a point of reference, this question is meaningless.
Speed relative to the moon? the sun? some distance star?


-->

Answer 7

A vague question

Answer 8

30 km/sec on its own axis i have read some where in my childhood

Answer 9

http://en.wikipedia.org/wiki/Earth
use the table in this site