Aliens are either citizens of other countries or, in science fiction terms, creatures from other planets/galaxies. How much are they? It depends on the jobs they are hired to perform.
XLR8
Cowboys and Aliens grossed $175,910,315 worldwide.
Aliens in the Attic grossed $59,551,283 worldwide.
There is no solid proof aliens even exist much less have visited Earth.
Cowboys and Aliens grossed $100,240,551 in the domestic market.
Aliens in the Attic grossed $25,200,412 in the domestic market.
Alien grossed $203,630,630 worldwide.
Monsters vs. Aliens grossed $381,687,380 worldwide.
Monsters vs. Aliens grossed $198,351,526 in the domestic market.
how much does a alien weigh
Aliens grossed $85,160,248 in the domestic market.
We humans don't know much about these aliens, so this question has not yet been answered positively.