This is a large amount of dust, but it makes up only a fraction of a dark halo's total mass of some 1000 billion solar masses. (newscientist.com)
They have about the same total mass, and we used to think they were near - twins. (newscientist.com)
The car's performance is thus enhanced thanks to a better power - to - weight ratio and reduced total mass, which means that CO2 emissions are also lower. (lambocars.com)