Snapshots from Atlas 5 launch

Poised for its one and only satellite launch of the year, the National Reconnaissance Office will conduct a hush-hush flight Thursday using a United Launch Alliance Atlas 5 rocket from California.

NASA’s Mars Opportunity rover landed on Mars 15 years ago this week, but the long-lived robot remains out of action in the wake of a global dust storm last summer that caused it to lose power. Engineers are still trying to contact the spacecraft, sending commands and listening for any sort of response, but hopes are fading, a senior manager said Friday.

A forecast of low ceilings, thick clouds and rainy weather Thursday has led NASA and Northrop Grumman officials to push back the launch of an Antares rocket and a space station-bound supply ship from Virginia’s Eastern Shore to Friday morning.