Every year in early January, Earth reaches the closest point in its orbit to the Sun, a moment astronomers call perihelion.

Comet 3I/ATLAS is hitting a major milestone on Oct. 30, 2025. The interstellar comet is reaching perihelion, its closest point to our Sun, marking the climax of its brief journey through our solar ...

Earth’s orbit around the Sun isn’t a perfect circle—it’s slightly elliptical. Each year, around July 2 or 3, Earth reaches its farthest point from the Sun, known as aphelion. Around January 2 or 3, ...

Imagine catching a fleeting glimpse of a visitor from beyond your known neighbourhood, a traveller moving at impossible speeds, and then trying to plot its exact route. That's the challenge ...

A strange shift in Earth's rotation is making our days milliseconds shorter — and scientists are racing to understand why. When you purchase through links on our site, we may earn an affiliate ...