Live launch coverage from Kazakhstan begins at 14:45 UTC (10:45 a.m. EDT). You can also watch the spacecraft dock with the ISS, starting at 21:15 UTC (5:15 p.m. EDT). Translate to your timezone.
Mysterious long-period comets might be more common - and bigger - than astronomers thought. Studies like this one will help reveal what kind of hazard they might pose.
An exotic effect in particle physics, theorized to occur in immense gravitational fields — near a black hole, or in conditions just after the Big Bang — has been seen in laboratory crystal.
Venus - the brightest planet - is in the east before dawn now. Chirag Upreti caught Venus on July 22 over Acadia National Park in Maine. The dipper-shaped cluster above it is the Pleiades, or Seven Sisters.
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