NASA fueled its $4 billion Roman Space Telescope for an Aug. 30 launch — nine months ahead of schedule — while a private $30 million mission to save the aging Swift Observatory is tumbling out of control after reaction wheel failures. Meanwhile, SpaceX's Starship Flight 13 achieved its first-ever soft ocean splashdown.

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Roman Space Telescope: Fueled and Counting Down

• What happened: NASA completed fueling the Roman Space Telescope with hydrazine on July...