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An illustration of the NROL-146 mission patch design. Graphic: NRO The National Reconnaissance Office (NRO) is set to start building a constellation of unknown size with a middle-of-the-night launch from Vandenberg Space Force Base in California. The mission, dubbed NROL-146, features an undisclosed number of satellites riding onboard a SpaceX Falcon 9 rocket. Liftoff from Space Launch Complex 4 East (SLC-4E) is set for the start of a launch window that opens 1 a.m. PDT (4 a.m. EDT, 0800 UTC). Spaceflight Now will have live coverage beginning about 30 minutes prior to liftoff. The Falcon 9 first stage booster supporting this mission, tail number B1071 in the SpaceX fleet, will launching for a 16th time. It’s first two flights were for NRO missions and it also launched a pair of Transporte...

Messier 3 is a great globular cluster of the late-spring sky. Image: Adam Block. During late spring or early summer—whichever term you choose, likely depending on how fine the weather has been—is the best time to seek out and observe globular clusters, which are among the most striking and impressive categories of deep-sky objects. Globular clusters are densely-packed, near spherical collections of ancient stars that populate mainly the extended outer halo of our galaxy. They are believed to have formed in the very early life of our Galaxy, over 11 billions years ago; Messier 3 is thought to be 11.4 billion years old. Astounding star densities exist inside even run-of-the-mill globulars; on average, 0.4 stars per cubic parsec (a parsec is equal to 3.26 light years), rising to 100 to 1,000...

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SpaceX to launch first batch of satellites for the NRO’s reconnaissance satellite constellation – Spaceflight Now

Resolving Messier 3’s swarming stars – Astronomy Now