| For use on: | Description | Size |
| Radio | 16 bit 44.1 kilohertz stereo WAV | 5.2 MB |
| Radio | 320 kbps MP3 | 1.1 MB |
| on-line | Mono-56kps MP3 | 208 KB |
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Full Transcript (below)
2. Q: What happens to a spacecraft when it comes through an atmosphere at high speed?
Fretter: "Generally, at the edge there, where we start running into the gas molecules, it starts forming a shock layer. In other words, the object may be coming in like the Shuttle, around Mach 25. And it forms a shock layer in front of the spacecraft, and on the other side of the shock, the gas goes from cold air to very hot, disassociated plasma -- and that's where the extreme heating is that a spacecraft sees when it comes through the upper edges of the atmosphere." (31 SECONDS)