It will be the first U.S.-led mission to the Venusian atmosphere since 1978.
There may be bizarre microbes living in the sulfuric acid-laden clouds of the hothouse planet, scientists said.
"...two hundred and fifty degrees, and raining sulphuric acid."
Mercury, Venus, Saturn, Mars and Jupiter will align for first time in a decade.
Venus, Mars and Jupiter won't be visible together again for another six years.