Learn how to build an icy model of a comet, complete with shooting jets. Safety precautions are required.


[00:00:00]Music: Theme

[00:00:07]Hi, my name is Art Chmielewski. I'm the NASA Project Manager of the Rosetta Mission, which will land

[00:00:14]a European spacecraft on a comet.

[00:00:17]And today we will learn how to build a model of a comet.

[00:00:22]It will be a working model of a comet with jets, gas, just exactly as it happens in space.

[00:00:31]We're dealing with very cold materials.

[00:00:34]We're going to use goggles here.

[00:00:36]We're going to use safety gloves.

[00:00:38]And we're going to be very careful in how we put all the ingredients together.

[00:00:43]Now this is just regular water but it is important because there is a lot of water in comets.

[00:00:50]And what are the other ingredients?

[00:00:53]1 liter water (comets have lots of water) and 2 cups dirt (minerals, water and dust)

[00:00:58]1 Tbsp. starch (optional to hold our comet together) and 1 Tbsp. syrup (for organics)

[00:01:01]1 Tbsp. vinegar (for amino acids) and 1 Tbsp. rubbing alcohol (for methanol)

[00:01:07]And for me, very important ingredient to make this model enjoyable, some ice cream.

[00:01:19]Hmm, I love doing these shows.

[00:01:28]Very well, we are ready for dry ice.

[00:01:30]I put this dry ice here and we're going to put it in our water soup.

[00:01:38]5 pounds of dry ice (with hammer or mallet crush into tiny bits; comets are icy dirtballs)

[00:01:42]You have to be very careful with this part. Look at all this moisture being frozen.

[00:01:51]Maybe even add a little bit of water here.

[00:01:55]Wow, that's going to be a big comet.

[00:01:59]This is actually not dangerous. You don't have to be afraid to inhale it

[00:02:04]because this is just simply moisture in the air being frozen out by the gas that is coming out of dry ice.

[00:02:12]So that's nothing dangerous.

[00:02:16]Oh, you see, good that I have my safety goggles on.

[00:02:20]It's shooting out gas, just like comets shoot out geysers from all these different sides.

[00:02:27]Here's our comet.

[00:02:30]Oh, we're just about, just about to make another comet.

[00:02:36]This will be one of the smaller comets but, you know, there are comets that size.

[00:02:42]They fly through our solar system all the time.

[00:02:47]Most of the comets are bigger. They are about the size of an average city.

[00:02:52]So here's your comet. No matter what you got, it's still an accurate model of a comet

[00:02:57]because comets come in all shapes, sizes, some of them are darker, some of them are lighter,

[00:03:03]producing more gas, shooting out jets from different locations.

[00:03:08]So what you got is a very good model of a comet.

[00:03:12]I hope you enjoyed making it and I hope you had right ingredients.

[00:03:18]One of them is delicious ice cream. Love this hydrogen.

[00:03:31]NASA's Jet Propulsion Laboratory, California Institute of Technology
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