# @stem_antics on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DXDlDTUAMqo
- **Gondola URL:** https://gondola.cc/posts/64172114-stem-antics-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/c842da236f.jpg
- **Posted:** 2026-04-13T02:59:03.000+00:00
- **Account Owner:** Stem Antics (@stem_antics) — https://gondola.cc/stem_antics

## Caption

When a spacecraft reenters Earth’s atmosphere, it isn’t just “getting hot”—it’s experiencing one of the most extreme thermal environments engineered against. At speeds exceeding Mach 25, compression of air in front of the vehicle creates plasma, driving surface temperatures above 1,500°C.

So how does NASA prevent catastrophic failure?

The answer is thermal protection systems (TPS), specifically heat-resistant tiles like those used on the Space Shuttle.

These tiles are primarily made from silica fibers—similar chemically to glass, but engineered into an ultra-low-density structure. Roughly 90% of each tile is air, which drastically reduces thermal conductivity. That means heat doesn’t travel efficiently through the material.

Instead of absorbing and transferring heat inward, the tiles localize it at the surface. The outer layer can glow red-hot, while the opposite side remains cool enough to touch shortly after reentry.

There are three key mechanisms at work:

• Low thermal conductivity: The porous silica structure traps air, limiting heat transfer via conduction.
• High emissivity: The tile surface efficiently radiates heat away as infrared energy, dumping thermal energy back into the atmosphere.
• Thermal capacitance control: The material stores very little heat, so it doesn’t retain energy long after peak heating.

Some regions use different materials entirely. Reinforced carbon-carbon (RCC), for example, protects leading edges where temperatures exceed what silica tiles can handle.

Modern spacecraft, like Orion spacecraft, use ablative heat shields instead. These don’t just resist heat—they actively erode, carrying thermal energy away through material loss and chemical reactions.

The key idea across all designs: don’t fight heat by blocking it—manage it by controlling how energy moves, stores, and leaves the system.

If you want more deep dives into real engineering systems, follow and share. What part of reentry physics should we break down next?

#STEM #AerospaceEngineering #NASA #Physics #EngineeringExplained

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## Tags

nasa, stem, physics, engineeringexplained, aerospaceengineering

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