But the probes map the gravitational field along North-South line, which makes the data look stripy.
The cost of mining them, and of lifting the heavy ore from Mars' gravitational field and carrying it to Earth was prohibitive.
Probably it detected us as soon as we entered the gravitational field of the planet.
You know that a gravitational field bends light; the light of a star is deflected in passing the sun.
Then we got past, and into the gravitational field of the planet.
As the intensity of the gravitational field decreased, the velocity of the ship increased—not linearly, but logarithmically.
The electromagnetic theory has to be modified to allow for the presence of a gravitational field.
In this sun's gravitational field, we'll lose a lot of power, but as long as it can be replaced, we're all right.
According to Boyle, a non-luminous and non-reflecting asteroid has crashed into the earth's gravitational field.
They were definitely within the moon's gravitational field; their last hold upon the earth was severed.