Spacewalking astronauts ventured out Sunday to install support frames for new, high-efficiency solar panels arriving at the International Space Station later this year.NASA’s Kate Rubins and Victor Glover put the first set of mounting brackets and struts together, then bolted them into place next to the station’s oldest and most degraded solar wings. But the work took longer than expected, and they barely got started on the second set before calling it quits.Rubins will finish the job during a second spacewalk later this week.The spacewalkers had to lug out hundreds of pounds of mounting brackets and struts in 2.5-meter (8-foot) duffel-style bags. The equipment was so big and awkward that it had to be taken apart like furniture, just to get through the hatch.Some of the attachment locations required extra turns of the power drill and still weren’t snug enough, as indicated by black lines. The astronauts had to use …