Scientists marveled Sunday as Opportunity, the second of two roving Mars probes, transmitted its first images from the planet’s surface, putting an $820-million research program back on track. The black-and-white and color photos showed the probe resting on a plain near a rock outcropping in an area of Mars known as the Meridiani Planum, where Opportunity touched down at 9:05 p.m. PST Saturday (12:05 a.m. ET Sunday).