Mercury is hard to spot, but you can catch it in the morning sky this month

A new cosmic map has reignited the debate surrounding the 'Hubble tension,' a discrepancy in the measurement of the universe's expansion rate. This development suggests that previous assumptions may need reevaluation, as researchers work to narrow down viable explanations for the observed inconsistencies.

In November, a rare solar super-flare resulted in a significant spike in cosmic radiation levels in Earth's atmosphere, reaching the highest levels recorded in nearly 20 years. This event underscores the dynamic nature of solar activity and its direct impact on our planet's environment.

Rare images captured just minutes before X-class solar flares erupted reveal active sunspots, which subsequently led to stunning auroras observed in November 2025. These flares are significant solar events that can impact Earth’s atmosphere and magnetic field.

A recent launch on November 27 resulted in damage to Russia's only active launch pad at the Baikonur Cosmodrome, which is critical for crewed missions to the International Space Station (ISS). This incident raises questions about the timeline for resuming manned spaceflights from Russia, as the damaged infrastructure directly impacts their ability to send astronauts into orbit.

The Geminid meteor shower, known for its bright and colorful shooting stars, is currently active, having begun on December 4, and is expected to reach its peak on the night of December 13-14. This annual celestial event is one of the highlights of the meteor shower calendar, attracting skywatchers worldwide.

The EURECA spacecraft, which flew aboard the space shuttle Atlantis in 1992, has been highlighted in a recent X-ray view that reveals its intricate metal structure. This image, shared on December 4, 2025, showcases the technological advancements in imaging and analysis of space equipment.

The last full moon of 2025, known as the 'Cold Supermoon', is set to illuminate the autumn sky on December 4, offering a spectacular view for stargazers. This celestial event is characterized by the moon's proximity to Earth, making it appear larger and brighter than usual. Observers are encouraged to witness this stunning phenomenon, which is a highlight of the astronomical calendar.

The final full moon of 2025, known as the 'Cold Supermoon', is set to rise on December 4, providing a spectacular view for stargazers. This event is characterized by the moon's proximity to Earth, making it appear larger and brighter than usual. Livestreams will be available for those unable to view it in person.