Si observas la fotografía de un tren, ¿puedes determinar si este tren está en reposo o en movimiento? ¿Por qué?

Which of the following represents an upside-down image?

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic