Which characteristics can be used to differentiate star systems? Select three options
A. the number of stars in the system
B. the level of dust and gas
C. the age of the stars in the system
D. the way stars are organized in the system
E. the color of stars in the system

Ascientist is tracking an object orbiting the sun that is found between mars and jupiter. in order to classify the object as an asteroid, it must be at least

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

Elements on the periodic table are ordered according to their