Although Rahu attempts to attack both the sun and the Moon, they are protected by Lord Visnu. Being very afraid of Lord Visnu's cakra, Rahu cannot stay in front of the sun or Moon for more than a muhurta (forty-eight minutes). The phenomenon that occurs when Rahu blocks the light of the sun or Moon is called an eclipse. The attempt of the scientists of this earth to go to the Moon is as demoniac as Rahu's attack. Of course, their attempts will be failures because no one can enter the Moon or sun so easily. Like the attack of Rahu, such attempts will certainly be failures.
Srimad Bhagavatam, Bhaktivedanta Book Trust, 1999. Canto 5, Chapter 24, verse 3, purport. Vedabase - Quotes from Books - Quotes from Books: Regression of Science