Visitors to the Smithsonian's National Air and Space Museum in Washington, DC, will soon have a chance to see those items Neil Armstrong kept from the Apollo 11 moon landing. This week's news about Armstrong's memorabilia got us thinking: What are some the other notable bits of tech NASA used to document space exploration? Well, the full list is a bit daunting, as the agency has been hard at work for decades. However, we've compiled a collection of the highlights, from the first US spacecraft to transmit close-up photographs of the moon's surface to X-ray telescopes used to capture cosmic explosions. We even tossed in a selfie for good measure.