When we look up at the stars, we are seeing the future", is this astronomer correct ? Why or why not ?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?