The 900-ton suspended platform of Puerto Rico’s famed Arecibo Observatory collapsed Tuesday after cable failures, crashing into the radio telescope’s iconic dish and shattering a research instrument used to study pulsars, galaxies, planets, and asteroids that might threaten Earth.

A new satellite joined Russia’s Glonass navigation fleet Saturday with a successful launch on top of a Soyuz rocket into an orbit nearly 12,000 miles above Earth.

This is the launch timeline to be followed by the Atlas 5 rocket’s ascent into orbit from Vandenberg Air Force Base in California with the commercial WorldView 4 Earth-imaging satellite for DigitalGlobe. Launch is scheduled for Friday at 10:30 a.m. local time (1:30 p.m. EST; 1830 GMT).