During its initial molten phase, the Moon experienced tidal bulges on its near and far sides due to Earth's immense gravitational pull. The Moon's rotation initially carried these gravitationally ...

Mariner 1 and 2, twin spacecraft developed from the Ranger lunar probe and equipped with seven instruments, were designed for a joint mission to Venus; however, Mariner 1 failed minutes after its July ...

On December 12, Uranus will be observable in western Taurus, situated 7 arcminutes due south of the 6th-magnitude star 14 Tauri, providing an identification aid. The Geminid meteor shower is forecast ...

At least two ingredients are needed to make jets — rotation and magnetic fields — and these produce the ubiquitous laserlike jets we see.

Mercury's visibility is noted to be improving, appearing 7° high an hour before sunrise with a magnitude of –0.3 and a 54% illuminated disk. The planet is approaching its greatest western elongation, ...

Interstellar Comet 3I/ATLAS will reach perihelion, its closest approach to the Sun, on October 30, 2025, marking the climax of its brief, hyperbolic trajectory through our solar system before its ...

Primordial nucleosynthesis during the early universe generated hydrogen, helium, and minor lithium-7 before the cosmos cooled, halting further fusion. Stellar interiors synthesize elements up to iron ...

Multiple planetary observations are detailed, including a dual shadow transit of Io and Europa on Jupiter's cloud tops (visible on the U.S. West Coast), an occultation of Io by Jupiter's shadow, and ...

On October 23, the Moon will pass 0.5° south of Antares, observable low in the southwest approximately 40 minutes after sunset, potentially revealing earthshine and Mare Crisium with binoculars.

Apollo 7, crewed by Walter Schirra Jr., Donn Eisele, and Walter Cunningham, represented the first manned American spaceflight 21 months after the Apollo 1 fatal accident. Launching on October 11, 1968 ...

Saturn reached opposition at 2 A.M. EDT, exhibiting high visibility throughout the night and presenting optimal viewing conditions for its rings and moons. Saturn's apparent magnitude was 0.6 in ...

A close conjunction of the waning crescent Moon (approximately 26% illuminated) and Jupiter occurred around 7 A.M. EDT, observable in the eastern sky before sunrise, with the Moon positioned between ...