This week's science news.

A colossal valley near Mars’s equator is revealing dramatic clues about the Red Planet’s watery and volcanic past. Stretching roughly 1,300 kilometers, Shalbatana Vallis was carved billions of years ago when enormous floods of groundwater burst onto the surface,

Scientists are especially interested in regions like Shalbatana Vallis because they preserve evidence that Mars was once far warmer and wetter than it is today.

The first human Mars explorers won’t have it easy. Every additional day in deep space will increase their exposure to deadly cosmic radiation, while isolation gnaws at their minds and microgravity erodes their muscles.

Perseverance captured the composite image using 61 individual snapshots taken by the camera mounted at the end of its robotic arm, according to NASA.

Perched along the rugged western rim of Jezero Crater, NASA's Perseverance rover snapped a dramatic new selfie revealing ancient Martian terrain, fractured cliffs and clues to the Red Planet's distant past.

"I Just Might" ties "Uptown Funk!" as Bruno Mars's longest-running No. 1 on Billboard's Radio Songs chart as it earns a twelfth frame running the show.