Tag

Comet

All articles tagged with #comet

The Tunguska Mystery: The 1908 Airburst That Flattened a Forest Without a Crater
science1 day ago

The Tunguska Mystery: The 1908 Airburst That Flattened a Forest Without a Crater

In 1908 a space object exploded over Siberia in an airburst, releasing roughly 10–15 megatons of energy and flattening about 80 million trees across 830 square miles, with no crater and a ring of standing trees at the center. Scientists still debate whether it was a stony asteroid or a comet; the asteroid answer fits the ground damage while the comet explanation could account for the eerie skyglow seen across Europe. No fragment has ever been found, and the event helped spur modern planetary defense efforts, including NASA’s DART mission.

Distant Solar System Visitor Illuminates Our Origins
space16 days ago

Distant Solar System Visitor Illuminates Our Origins

Astronomers say comet C/2025 R3 PANSTARRS — a long-period visitor likely from the Oort Cloud — has been visible in the northern hemisphere for weeks, offering a rare glimpse at material from the solar system's birth. With such comets taking extremely elongated orbits, this one may not return for around 170,000 years, making its current pass a unique opportunity to study early solar-system building blocks and clues about how planets formed, as gravitational interactions could eventually eject it from the system.

PanSTARRS Flaunts Dual Tails During Close Earth Approach
stargazing29 days ago

PanSTARRS Flaunts Dual Tails During Close Earth Approach

Space.com reports that Comet C/2025 R3 PanSTARRS displayed its ion tail as it passed about 45 million miles (72 million km) from Earth, with a dust tail lagging behind. The comet heated as it neared the Sun (perihelion on April 19) and then reached its closest approach to Earth around April 26, with SOHO imagery capturing the ion tail brightening and pointing away from the Sun.

Comet PanSTARRS Slides Past Earth in a Real-Time Sky Show
space1 month ago

Comet PanSTARRS Slides Past Earth in a Real-Time Sky Show

A brightening Comet C/2025 R3 (PanSTARRS) will skim about 45 million miles past Earth, its closest approach on April 26, after surviving perihelion on April 19. The comet is visible in space-based imagery and can be tracked in near real time via the SOHO LASCO instrument and NOAA data feeds; it poses no threat and will fade as it moves away. Under dark southern skies it may be glimpsed with naked-eye, while binoculars reveal more detail as it traverses the solar-ward field.

3I/ATLAS Traces Ultra-Cold Origins of an Interstellar Comet
science1 month ago

3I/ATLAS Traces Ultra-Cold Origins of an Interstellar Comet

Astronomers using the ALMA Observatory found that interstellar comet 3I/ATLAS contains unusually high deuterium in its water, implying it formed in a very cold, loner star-forming region long before the Sun. The object could be the oldest known interstellar visitor (up to about 11 billion years old); its nucleus is estimated to range from a quarter-mile to 3.5 miles (440 meters to 5.6 kilometers) across, and it is speeding away from the Sun at roughly 137,000 mph. The findings, published in Nature Astronomy, add context to other interstellar visitors like Oumuamua and 2I/Borisov.

Interstellar Comet 3I/ATLAS Unveils Hidden Chemistry Near the Sun
space1 month ago

Interstellar Comet 3I/ATLAS Unveils Hidden Chemistry Near the Sun

New measurements of interstellar comet 3I/ATLAS show its coma chemistry changing after a close pass to the Sun, with the CO2-to-water ratio shifting between observations in late 2025 and early 2026 (including Subaru data from Jan 7, 2026 and JUICE observations in Nov 2025). The results imply the comet’s internal chemistry differs from its external makeup, offering insights into planetesimal and planet formation in other star systems; the work by Yoshiharu Shinnaka and collaborators will be published in the Astronomical Journal on April 22, 2026.

Comet PanSTARRS to Shine in Predawn Sky Before It Vanishes
space1 month ago

Comet PanSTARRS to Shine in Predawn Sky Before It Vanishes

Comet C/2025 R3 PanSTARRS should reach naked-eye visibility (magnitude ~4.7) in the eastern predawn sky on April 17, about 90 minutes before sunrise, low on the horizon and a few degrees above Algenib in Pegasus. Locate the Great Square and spot PanSTARRS about five degrees above the star; binoculars (10x50) can reveal its glowing nucleus. The comet will brighten toward its perihelion around April 19, then move southward and fade from Northern Hemisphere skies for the foreseeable future.

Predawn PanSTARRS: Stunning Naked-Eye Comet Over Somerset
space1 month ago

Predawn PanSTARRS: Stunning Naked-Eye Comet Over Somerset

British astrophotographer Josh Dury captured a striking predawn image of comet C/2025 R3 (PanSTARRS) rising above the Mendip Hills in Somerset, England, as light pollution created a false dawn; the bright nucleus and a tail spanning about 10 degrees are visible to the naked eye ahead of PanSTARRS' perihelion around April 19–20, using 33 long-exposure frames with a Sony A7S III and a 135mm lens, and the comet likely originates from the distant Oort Cloud with an orbital period of about 170,000 years.

April 2026 Skywatch: Mercury's Best View, Green Comet Glow, and Lyrid Meteors
science1 month ago

April 2026 Skywatch: Mercury's Best View, Green Comet Glow, and Lyrid Meteors

April 2026 offers a rare string of skywatching events: Mercury reaches its greatest elongation on April 3 for one of the year’s clearest views; Comet C/2025 R3 brightens in mid-April with a green glow and peaks around April 17, followed by its closest approach to Earth on April 27; the Lyrid meteor shower peaks April 21–22 with about 15–20 meteors per hour, providing multiple rewarding nights of stargazing in the Northern Hemisphere.

Interstellar Visitor 3I/ATLAS Exhibits Methanol-Rich Comet Chemistry
space2 months ago

Interstellar Visitor 3I/ATLAS Exhibits Methanol-Rich Comet Chemistry

ALMA observations of the interstellar object 3I/ATLAS reveal an unusually high methanol abundance in its coma and core—among the highest seen in comets—paired with a high methanol-to-hydrogen cyanide ratio, indicating distinctive formation conditions in that distant system. The methanol appears to come from both the core and the coma, and future observations with advanced telescopes could help explain the object’s origin as it exits the solar system.

ARC Raiders Unveils Firefly and Comet, Deploys Fresh Tactics for Topside Skirmishes
gaming3 months ago

ARC Raiders Unveils Firefly and Comet, Deploys Fresh Tactics for Topside Skirmishes

ARC Raiders introduces two new top-side enemies: Firefly, a tenacious aerial threat, and Comet, a heavily armored rolling explosive. Tactics include using a Photoelectric Cloak or exploiting the Firefly’s fuel tank while staying in solid cover or indoors; lure grenades can help against Firefly, and aggressive, surgical shots are advised. For the Comet, aggro from a distance to make it expose its inner weak point, use high rate-of-fire or armor-piercing ammo, spread out your squad to minimize group damage, and target armor plating on the sides or the front when it reveals weak points. Quick thinking and coordinated play are key to surviving these predators.”,