Based on the data in the HR diagram, what star is BOTH hotter and brighter than our Sun? Epsilon Eridani

Capella

Antares

Rigel

A. to determine if humans can explore mars safely

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to move. 

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;