Spaceflight News

— Mars oxygen and helicopter sighting (space.com) (HT Stygarfield: nasa.gov) 

— Vega C delayed after engine test failure (europeanspaceflight.com) (spacenews.com)

Short & Sweet

— Virgin Galactic completes first fully commercial flight (spacenews.com) (spacenews.com)

— Euclid telescope prepares for launch (spacenews.com)

— Dream Chaser prepares for launch (spacenews.com)

Questions, Comments, Corrections

— Unc’ Willy: L2 is closer than the sun, and CMB was discovered in 1964 (discord.com)

This Week in Spaceflight History

—  July 7, 2003: The launch of MER-B (Opportunity) aboard the Delta II Heavy (en.wikipedia.org) (mars.nasa.gov) (theorbitalmechanics.com)

— ULA has an excellent payload guide for Delta II (ula.bsshost.me)

— Next week (7/18 - 7/24) in 2017: Do you ever feel like a sample bag/drifting through the wind, wanting to sue again?