The sun's ascent above Earth's horizon is observed from the International Space Station, marking the approaching peak of ...

This discovery marks the first known case of a compact planetary system with such a noticeable tilt between close planet ...

Since Kepler's laws of motion dictate that celestial bodies orbit more slowly when farther from the sun, we are now moving at ...

On Jan. 4, Earth received its maximum radiation from the sun, which was at its largest in the sky for 2025. The difference isn't huge — the sun today appears to be a mere arcminute (1/60th of a degree ...

Summer began 84 million years ago, when the earth’s axis tilted twelve degrees. Before that, there were no seasons. We don’t ...

I was looking forward to writing a tribute to clear summer skies and great summer stargazing in the Pacific Northwest.

Saturn’s moon Titan has always stood out among the celestial bodies in our solar system. It is the only moon with a thick, hazy atmosphere, and it's often compared to a primitive Earth.

June 21, 2025, marks the summer solstice in the Northern Hemisphere, bringing the longest day and shortest night of the year.

Since the solstice occurs so late at night Philly time, is the longest day the 20th or the 21st? The answer: Both. The ...

As the Earth travels around the sun, it does so at an angle relative to the sun. For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and ...

The summer solstice is a moment in space and time during the annual orbit when our tilted planet’s Northern Hemisphere points the most toward the sun.