Science ❯Astronomy

Celestial Mechanics

Orbital Dynamics Lunar Phases Gravitational Interactions Planetary Orbits Comets Moon's Orbit Gravitational Forces Planetary Motion Earth-Moon-Sun Alignment Earth-Moon System

New Projections Confirm Record-Short Days This July and August

Experts remain baffled by Earth’s faster spin, prompting timekeepers to prepare for possible UTC adjustments.

July 9 Recorded Among Shortest Days as Earth’s Spin Continues to Accelerate

Earth's Spin Breaks Short-Day Records as Timekeepers Halt 2025 Leap Second

Global Telescopes Capture Active Coma of Interstellar Comet 3I/ATLAS

Active Interstellar Comet 3I/ATLAS Set for Safe Solar System Passage

Three Record-Short Days Ahead as Earth’s Spin Accelerates

Interstellar Comet 3I/ATLAS Enters Inner Solar System

Earth Could Set Shortest Day Record in July or August 2025

Probability of Asteroid 2024 YR4 Striking the Moon Climbs to 4.3%

Unstable Asteroids Near Venus Could Threaten Earth Over Centuries

New Dwarf Planet Discovery Challenges Planet Nine Despite 40% Simulated Odds

New Dwarf Planet 2017 OF201 Undermines Case for Planet Nine

Study Reveals Jupiter’s Early Size and Magnetic Power

Newly Cataloged Extreme Trans-Neptunian Object Challenges Planet Nine Hypothesis

New Candidate for Planet Nine Challenges Original Hypothesis

Uranus’ Day Found to Be 28 Seconds Longer Than Previously Measured

Asteroid 2024 YR4 Ruled Out as Earth Threat, Moon Impact Still Possible

Vacheron Constantin Unveils World's Most Complicated Wristwatch at Watches & Wonders 2025

Partial Solar Eclipse to Grace Northern Hemisphere Skies Today

Partial Solar Eclipse to Grace Skies on March 29