1 AU is the average distance between the Earth and the Sun and is approximately equal to 150,000,000 km (or 1.5 × 10 11 m). Distances between the Earth and other stars and galaxies are measured ...

The world’s biodiversity is declining at an alarming rate. Population sizes of vertebrate species measured by the Living Planet Index (LPI) have more than halved in little more than 40 years. The LPI, ...

A new analysis examined the frequencies of planets of different sizes based on findings from ... show that one in six stars has an Earth-sized planet in a tight orbit. About a fourth of all ...

During just one night – 28 February – they will be joined by Mercury, a rare seven-planet alignment visible in the sky. It is a spectacle that will not be visible again until 2040. But such ...

In February 2025, the seven planets joining Earth in our solar system will be visible all at once in the night sky as they get arranged in an extraordinary pattern called a “great planetary alignment, ...