Strangely, âposhliâ (which means âletâs goâ or âletâs head outâ in Russian) is actually the past tense of the verb meaning âTo head off on foot.â In other words, âposhliâ literally means, âWe (or they) headed off on foot.â How can a word which is in the past tense indicate the desire to head off somewhere now?
The Hill sphere, or gravitational sphere of influence, of Earth is about 1.5 Gm or 1,500,000 km in radius. This is the maximum distance at which the Earth's gravitational influence is stronger than the more distant Sun and planets.
Letâs take a look at how big our planet is. Blue marble Earth. Image credit: NASA. First, the equatorial diameter of Earth is 12,756 km. In other words, if you dug a tunnel on the equator that went straight down and went right through the center of the Earth, it would be about 12,756 km long.Just for comparison, thatâs about 1.9 times the diameter of Mars.he mass of Earth is 5.97 x 10 24 kg. Here that is written out: 5,970,000,000,000,000,000,000,000 kg. Yeah, thatâs a really big number. And yet, itâs only 0.3% the mass of Jupiter (and Jupiter is mostly lightweight hydrogen).