https://www.reuters.com/article/us-virgin-galactic-offering/virgin-galactic-files-for-500-million-stock-sale-shares-tumble-idUSKBN2EI1EE >(Reuters) -Virgin Galactic Holdings Inc on Monday filed to sell up to $500 million in common stock, a day after the company completed its first fully crewed test flight into space with billionaire founder Richard Branson on board.