What is the weight of the Earth?

What could happen if the earth was half its weight?

• According to the theory of evolution the species as we know them evolved in millions and millions of years,for that we need an old earth,so they say that the earth is about 4,500,000,000 years old,but there is a problem there,since the earth is 4.5 billion years how heavy was the earth 4.5 billion years ago? The earth's weight is 5, 973, 600, 000, 000, 000, 000, 000, 000 kilograms and they also say that the earth is 4,500,000,000 years old,we also know that every year we get about 40,000 tons of space dust (40,000,000 kilograms) Then 4,500,000,000 x 40,000,000 = about 180,000,000,000,000,000 then 5, 973, 600, 000, 000, 000, 000, 000, 000 -- 180,000,000,000,000,000 = about 417,360,000 so the earth 4.5 billion years ago was about 417,360,000 ? Anyway the point is that if the earth 4.5 billion years ago was so small compare to what it is righ now the earh should be farther away from the sun than what it is right now,what could be the consequences?

• Answer:

  The way the planets formed was the heavier ones were closer to the sun and the Jovian planets (gas giants) were on the outside because they are not as dense. There is a certain point at which the suns heat cannot keep water from freezing therefore thats why the jovian planets are formed of ice. The planets formed by orbiting the sun and collecting debris that was in their plane of orbit. I think your math is a little off, I think the planet only collects 14,000 tons of space dust a year. It is not like the Earth was a perfect ball when it was a million years old. The process of a planet orbiting a star and collecting debris a random process because the debris field was not just dust but large pieces of rock.