** Space tourism company Virgin Galactic's SPCE.N shares fall ~13% to $6.20 premarket

** Company enters sales agreement under which it may offer and sell its common stock of up to $300 mln

** Plans to use proceeds from the sales to further accelerate development and production of its spaceflight fleet

** SPCE has jumped 35% from an all-time low of $5.27 in early August

** YTD, stock has lost 85%

(Reporting by Medha Singh)

((medha.singh@thomsonreuters.com))