Rocket Roundup for July 28, 2021

<p>For this week’s Rocket Roundup, we have exactly zero launches to cover. What’s up with that? In the meantime, we talk about Europa Clipper’s launch announcement, Blue Origin’s attempt to be a part of Artemis, and what a NOTAM is and how we use it. Plus, this week in rocket history, we look back at the launch of the Chandra X-ray Observatory.</p>