Conspiracy theorists seem to believe anything (a trait they seem to share with many liberals, it seems). Here’s a site trying to debunk some moon-landing conspiracy theories.
The virtual vault of knowledge that is Wikipedia has as today’s featured article the subject of Redshift.
In physics and astronomy, redshift occurs when the visible light from an object is shifted towards the red end of the spectrum. More generally, redshift is defined as an increase in the wavelength of electromagnetic radiation received by a detector compared with the wavelength emitted by the source.