Collection:

Original RL-10 engine
The first oxygen/hydrogen engine, it had regenerative cooling and even impressed Werner Von Braun with its performance.  This particular model has parts from serial number 1 or 2 on it.  It’s had an incredibly long service life – designed in 1959 and is still used on rockets to this day.

Apollo Couch
This model was not flown but used on the ground, probably for training purposes.

External EVA handle from Apollo 11
This is the only handle like this that exists on earth, all the other handles were destroyed due to radioactive waste.  The glow in the dark tabs on each side contain promethium-147 which is radioactive but has a short half life.  This handle was saved to see whether the handle would crack and leak the radioactive material, which it never did.

Skylab bike
Contains mechanical display systems and custom pedals with locking mechanisms for shoes, due to low gravity.

Several pieces of spacecraft that blew up

An entire lunar module flight computer
All the elements of the flight computer, with some of the software intact.  This particular unit is from LM2 – the lunar module in the Smithsonian.  This flight computer was used in the very first test flight of a digital fly by wire conformation.

The first Hasseblad camera in space

Astronaut Wrist checklist
Worn by John Young on the moon during his famous jump shot

Optical alignment sight from the lunar module

An armrest from the lunar lander

Telescope eyepiece from Apollo 13

Command module air filter system

TR201 Engine

A hypergolic pressure-fed rocket engine with no regenerative cooling

Fuel cell used to test Apollo equipment

Same type as the one that exploded on Apollo 13, generates 1400 watts continuously.

Valve assembly for Apollo SPS engine

Russian scramjet engine for launch

SpaceX DM2 panel

Located right above the hatch, this panel pops off in order for the parachutes to deploy

Lunar orbiter components

High gain antenna

Omnidirectional low gain antenna

A complete solar panel

An engine from the Corona program

A scope and camera from the first secret weaponized space station

First Apollo sextant

Used in all subsequent Apollo missions for guidance controlled

Mission control console

Contains a gemini clock from the bunkhouse, seen in a photo in mission control.  The console was used in the control room as well as the movie Apollo 13.  It still has all the internal wiring.

Sample processing module from the Viking mars lander
Contains a gas chromatograph, a mass spec, and three other instruments for life detection. 

Logo shingle from Mercury Sigma 7

Core memory block from Saturn V

Headset used on the first rover ride on the moon

A complete Soyuz deck

It has an analog computer that could land with no electricity whatsoever.  Everything is modular, and the original extremely loud mechanical clock was replaced with a digital clock.

Command module forward tunnel hatch

Flown hatch from first Voskhod flight

A chunk of Mars

Validated by mineral analysis and trapped air bubbles of martian atmosphere.  This sample was not brought back by humans but rather ejected by Mars due to a meteor impact and landed naturally on Earth.

Several chunks of the moon and asteroids

A signed poster of a successful flight of SpaceX

This was a project by Steve right after that infamous 60 minutes interview where Elon teared up hearing negative testimony from Neil Armstrong and Gene Cernan.  Neil’s testimony was taken totally out of context and had 60 minutes publish a retraction.  Steve got signatures from Apollo astronauts in support of SpaceX and wanted to convince Gene to come out and support SpaceX.

An extra shell of Sputnik

A prototype build of the American flag that was placed on the moon