Why are the milky way and andromeda colliding when the universe is expanding?

Which of the following is defined as combinations of soil particles that vary in size and shape?

Exactly what kind of weather conditions would a cold front produce?

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.