2019年6月20日 星期四
2019年6月19日 星期三
A View Toward M106
Big, bright, beautiful spiral, Messier 106 dominates this cosmic vista. The nearly two degree wide telescopic field of view looks toward the well-trained constellation Canes Venatici, near the handle of the Big Dipper. Also known as NGC 4258, M106 is about 80,000 light-years across and 23.5 million light-years away, the largest member of the Canes II galaxy group. For a far away galaxy, the distance to M106 is well-known in part because it can be directly measured by tracking this galaxy's remarkable maser, or microwave laser emission. Very rare but naturally occurring, the maser emission is produced by water molecules in molecular clouds orbiting its active galactic nucleus. Another prominent spiral galaxy on the scene, viewed nearly edge-on, is NGC 4217 below and right of M106. The distance to NGC 4217 is much less well-known, estimated to be about 60 million light-years. via NASA https://go.nasa.gov/2Y3W18C
SpaceX Looks At November Launch For Crewed Dragon Mission
Space Exploration Technologies Corp. Application For Special Temporary Authority (FCC)
"This application uses information from previous grant 0068-EX-ST-2019. This STA is necessary for Dragon2 capsule telemetry, tracking, and command, for the upcoming SpaceX Commercial Crew vehicle demonstration mission to the International Space Station. The launch and re-entry licensing authority is the FAA. Launch is also to be coordinated with the Eastern Range. On-orbit rendezvous with the ISS is to be coordinated with the NASA.
Requested Period of Operation
Operation Start Date: 11/01/2019
Operation End Date: 05/01/2020"
from NASA Watch http://bit.ly/2MTy2Yj
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