For the second time in less than four months, an Orbital ATK Cygnus cargo spacecraft is set to launch to the International Space Station on an Atlas 5, carrying more than three tons of supplies and science investigations.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...