This astronaut photograph, taken from the International Space Station, shows the northernmost parts of the Cape Cod National Seashore, also known as Provincetown Spit.
Long before Cape Lookout National Seashore was declared a national tourist treasure, it was home to an important lighthouse and a commercial port. The park has its 50th anniversary this week.
New elevation measurements will give researchers an unprecedented understanding of the thickness of sea ice, which will be used to help improve climate modeling and forecasts.