Astronomers are pushing back against plans by NASA to cut the budgets of two venerable space telescopes, arguing that the cuts to one of them could jeopardize the future of X-ray astronomy in the United States.

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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...