The distribution of galaxies in the universe is not regular, but clumpy. galaxies, some of them one billion light years from the sun, tend to clump together into huge supercluster formations. this is an image of the perseus-pisces supercluster. some galaxies are visible with the naked eye, but astronomers discovered these distant galaxies with the of a) space probes. b) satellite imaging. c) manned space craft. d) x-ray and infrared telescopes.

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

The total amount of energy contained in an object

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same