Asteroid collision GriseldisFEA

Asteroid Griseldis Grows A Tail!

Many if not all the meteorites found on Earth came from collisions between asteroids. Asteroids with diameters of around 12 miles (20 km) suffer a strike from another body once every 10 million years on average. If the crackup happens at high speed, the asteroid shatters to pieces with rocks and dust blasted into space to form…
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This collage of radar images of near-Earth asteroid 2015 TB145 was collected by the Arecibo Observatory on October 30, 2015. The images show the rotation of the space rock, which made its closest approach on October 31 at 1 p.m. EDT (10 a.m. PDT) at a distance of 302,000 miles (486,000 km) – about 1.3 times the distance from Earth to the Moon. Image credit: NAIC-Arecibo / NSF

‘Spooky’ The Asteroid Comes Clean In New Radar Images

Spooky may be a rough character, but scary? Naw. The usual lumps and bumps, but given its small size, maybe more spherical than expected. On Halloween morning, the near-Earth asteroid 2015 TB145 (nicknamed ‘Spooky’) flew only 300,000 miles (486,000 km) from Earth and became bright enough to see in a modest-sized telescope. It was also the…
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Asteroid 2015 TB145 will give Earth a close (but safe!) shave overnight when it passes about 1.3 lunar distances from us. The illustration shows the many asteroids of the Main Belt between Mars and Jupiter and the orbit of 2015 TB145. Credit: NASA

How To Watch Tonight’s Spooky Flyby Of Asteroid TB145

First it’s a Supermoon, then Halloween fireballs hurtling from Taurus and now this — a chunky asteroid that will zip only a little farther than the moon from Earth overnight. Actual time of closest approach by the near-Earth asteroid 2015 TB145 occurs tomorrow morning around noon Central Daylight Time, but if you have a 6-inch or larger telescope,…
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Artist concept of planet Earth's last happy day before a strike by an asteroid. Credit: NASA

Does A Rogue Asteroid Threaten Earth Next Month? Nope

The doomsday crowd’s up to to their usual shenanigans again. Maybe some of you have seen predictions on websites about an asteroid expected to strike Earth between September 15 and 28. According to the rumor, the impact will occur near Puerto Rico and wreak catastrophic destruction not only to the island but also the Atlantic and Gulf…
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A 12.9-gram specimen of NWA 2710, an H5 stony chondrite, sparkles in the light. The shiny flecks are iron-nickel metal set in a stony matrix. Credit: Bob King

Meteorites From The “Wild West” Of The Asteroid Belt

H-chondrites are some of the most common meteorites. They account for 33% of the all space rocks seen to fall to Earth and about 40% of all those cataloged. If you go shopping for meteorites on eBay and dealer websites, the H-chondrites generally fall (excuse the pun) within most people’s budgets. “H” stands for “high metal”…
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