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.
The observable universe is approximately 90 billion light years in diameter and the Earth is approximately 12000km in diameter. Let's assume that a grain of sand is 0.5mm in diameter. If we shrink the Earth down to the size of that grain of sand it would become 1/24000000000 (one 24 billionth) its original size. The observable universe, shrunk down by the same factor, would become 3.75 light years in diameter.