Turns out some hummingbird bills have evolved for fencing as well as sipping nectar.

Abhijit Patil created this long-exposure image at Rocky Gorge in New Hampshire's White Mountain National Forest on January 5, 2019. "It's a tricky spot to shoot during the night," he wrote, "but the night views are spectacular and worth the risk."

Mars is the bright object near the moon these next several evenings. You'll find Mars much fainter than six months ago, but still as bright as our sky's brightest stars.

It shines with a brightness equivalent to 600 trillion suns. "We don’t expect to find many quasars brighter than that in the whole observable universe," said the astronomers.

Astronomers see many breathtaking merging galaxies, with their giant tidal streams of stars and unusual shapes. But some normal-looking galaxies might be merging, too. Now astronomers have a new tool to find out.

A new study analyzes pulses of radio waves coming from a magnetar - a rotating, dense, dead star with a strong magnetic field - located near the supermassive black hole at the heart of the Milky Way.

Because Earth's orbit isn't precisely circular, the size of the sun in our sky changes slightly throughout the year. This image shows that small variation in sun size.

Sun-entry dates to zodiac constellations in 2019, using boundaries for constellations set by the International Astronomical Union in the 1930s.

Astrology and astronomy differ. In some systems of astrology, zodiac signs remain fixed relative to seasonal markers, such as the equinox and solstice points.

Two-day-old moon - January 8, 2019 - from the frozen hills of Bacau, Romania.