Does the world get any heavier in terms of its weight?(excluding particles from space)?
The weight of an object is due to the effect of gravity on its mass. The only way the earth can get more mass is by particles etc from space, so we must ignore that. The way it can get more weight with the same mass is by going closer to a gravitational source. The most important gravitational object near the earth is the sun. The earth has an elliptical orbit, so twice a year it is further from the sun, and therefore lighter , and twice a year it is closer and therefore heavier. The Earth reaches perihelion – the point in its orbit closest to the Sun – in early January. So this is when it is heaviest. It is an annual event.
