There is a theory that gravity could pull galaxies back together, causing a reverse big bang.
which observation makes this theory less likely than the idea that the universe may continue to expand?
a.) background radiation is present.
b.) galaxies exist outside of the milky way.
c.) the expansion of the universe is accelerating.
d.) gas giants form farther from the sun, where temperatures are cooler.

Steam reforming of methane ( ch4) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the starting point for many important industrial chemical syntheses. an industrial chemist studying this reaction fills a 1.5 l flask with 3.5 atm of methane gas and 1.3 atm of water vapor at 43.0°c. he then raises the temperature, and when the mixture has come to equilibrium measures the partial pressure of carbon monoxide gas to be 1 .0 atm. calculate the pressure equilibrium constant for the steam reforming of methane at the final temperature of the mixture. round your answer to 2 significant digits.