Which statement is true about stars is correct?
f-star formation begins in a nebula
g- white dwarfs become main-sequence stars when they gain mass
h- supergiants are stars that can absorb black holes
j- main sequence stars are formed by comets

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?