Archive for the ‘Asteroid’ Category


I’m talking about asteroids vs dinosaurs at the Alf Museum tomorrow

April 13, 2018

Already posted this on SV-POW!, but I reckon there might be a few folks who check this blog but not the other.

If you are within striking distance of Claremont, come watch me cross the streams of my amateur and professional careers as I talk about the intersection of astronomy and paleontology. And if you can’t make it in person, check out the livestream on the Raymond M. Alf Museum page on Facebook. Show starts Saturday, April 14, at 2:30 PM PDT.

UPDATE: here’s the video of the talk.


A little piece of Mars

July 21, 2016

Mini Museum no 3614 DSCN1469

This is my Mini Museum: a collection of tiny samples of rare and interesting specimens from the history and prehistory of Earth and the solar system. There’s a lot of stuff in here that is very satisfying as both a paleontologist and an amateur astronomer. Highlights for me are the preserved woolly mammoth meat, the fiberglass casts of Diplodocus bones used as the Krayt Dragon skeleton in Star Wars: A New Hope, and, above all, the tiny piece of the Martian meteorite Zagami. It’s labeled “Martian atmosphere” because the meteor is known to contain tiny bubbles of Martian atmosphere in pockets of melted glass (Marti et al., 1995).

The specimens are embedded in a single block of acrylic that is 5 inches tall, 4 inches wide, and 1 inch thick. At $299 it’s not cheap, but it’s a pretty astounding collection of objects at any price. There is also a smaller, 10-specimen edition for $99. It doesn’t include Zagami or the Krayt Dragon, but it does have asteroid fragments, Stegosaurus plate, woolly mammoth meat, fulgurite, and the moon tree sample. These will sell out at some point, so if you’re interested in picking one up, don’t tarry.


Marti, K., Kim, J.S., Thakur, A.N., McCoy, T.J. and Keil, K., 1995. Signatures of the Martian atmopshere in glass of the Zagami meteorite. Science, 267(5206), p.1981.


Mission 17: See an asteroid

February 18, 2010

Mission Objective: Asteroid

Equipment: Binoculars

Required Time: 5 minutes

Instructions: Go to Heavens Above or fire up Stellarium and find the position of the asteroid 4 Vesta. It would be pointless for me to post a map for you, because by the time you read this, it will have moved at least a little. But do it soonish, because tonight–actually as I write this–Vesta is at opposition and thus as close to Earth and as bright as it is going to get this year. Also, right now it is cruising past the shoulder of the constellation Leo, close to the bright stars Algieba (same binocular field) and Regulus (close enough to get you moving in the right direction), which are bright enough that you should be able to see them even through light pollution. Use binoculars because you’ll want that wide field of view for sweeping from Regulus up to Algieba and then finding Vesta. You don’t need a scope for this one because there is literally nothing to see; Vesta is so tiny and so far away that you will not see it as more than a point of light.

While you gaze on this little point of light in your binoculars, you can reflect on the facts that Vesta was considered a planet for about four decades following its discovery in  1807, and that we have pieces of it that were blasted off in an ancient collision and have fallen to Earth as meteorites. (We’re pretty sure that these meteorites are bits of Vesta because they have the same composition.)

Have fun!