Peak sunshine has arrived in the Northern Hemisphere — the summer solstice. Friday is the longest day of the year north of the equator, where the solstice marks the start of astronomical summer.

From the largest canyon in the world to the tallest living tree, here are 12 American parks with amazing wonders.

July will kick off with colorful flashes of light during Independence Day celebrations across the United States, but the cosmos has a light show of its own in store for stargazers later in the ...

People are marking the start of the winter and summer solstices across the globe. North of the equator, celebrations welcome summer, while those in the south observe the beginning of winter.

Explore exotic, passport-free tropical destinations within US territories and beyond. From the US Virgin Islands and Puerto Rico to Guam and American Samoa, US citizens can enjoy stunning beaches ...

Newly discovered fragments of 2,200-year-old star coordinates—once thought lost—reveal the incredible skill of the ancient astronomer Hipparchus.