S03E94: SpaceX's Starship Milestones & Webb's Spiral Galaxy Revelation

[00:00:01] Welcome to Astronomy Daily. I'm your host, Anna. Today we have an exciting lineup of news from the world of space exploration. We'll kick things off with updates on SpaceX's Starship preparations, then delve into groundbreaking discoveries from the James Webb Space Telescope.

[00:00:16] Up next, we'll explore the latest achievements from China's Tiangong Space Station, including a recent spacewalk. And finally, we'll look at some fascinating advancements in CubeSat propulsion technologies. Let's dive into the cosmos and see what's happening out there.

[00:00:32] SpaceX is making remarkable progress on preparations for the fifth flight of its Revolutionary Starship program. One of the major tasks they're focusing on is replacing the heat shield on Ship 30. Over the past few weeks, they've been adding new ablative material and stronger tiles to the ship.

[00:00:52] The tank sections now feature four layers of material, along with a carbon-fiber material called pyron, which acts as an extra layer of protection, just in case the primary heat shield fails. In addition to the work on Ship 30, SpaceX is gearing up for a static fire test of booster 12.

[00:01:10] This booster has been in Mega Bay 1 since January and could be rolled out as early as July 8th or 9th. However, with Hurricane Barrel posing a threat, this could be delayed if Highway 4 gets flooded. SpaceX has already requested closures for testing on July 9th, 10 and 11,

[00:01:28] during which booster 12 will undergo a 33-engine static fire test. While these immediate tasks are critical, SpaceX is also making significant strides in long-term planning, particularly with Orbital Launch Pad B. The first tower module has been rolled out to the launch site,

[00:01:45] although it's yet to be stacked as corner adapters are being prepared. Notably, in a different approach from the original tower next door, Pad B will be a hollow steel structure filled with concrete, adding strength and protection from exhaust during launches.

[00:02:00] Teams have already integrated commodities lines and cryogenic propellant lines inside the modules before rolling them to the launch site, streamlining the assembly process. Progress doesn't stop there. At the Orbital Launch Pad A, SpaceX has removed the old vertical tanks from the Orbital Tank Farm

[00:02:16] and has switched fully to horizontal tanks since Flight 4. They have two new liquid methane tanks stored at Sanchez, which might be moved to the open space to enhance capacity. This is a crucial step as SpaceX plans to tie this tank farm into Orbital Launch Pad B

[00:02:32] once the tower and mount are completed. Moreover, SpaceX continues to refine its technology. Ship 31, for instance, rolled back to Massys for cryo-testing after undergoing repairs from a small explosion and electrical fire. Its readiness for static fire testing could come as soon as two to three months,

[00:02:49] provided it doesn't need a complete heat shield replacement like Ship 30. These meticulous preparations and upgrades clearly indicate that SpaceX is pulling out all the stops to ensure the success of their Starship program. When Elon Musk mentioned during Tim Dodd's Starbase tour

[00:03:05] that the new tower would be taller than the one at Pad A, the ambition was clear. Even though the FAA has set mid-August as the target for completing this new tower, the reality may extend a bit further. Overall, SpaceX's recent efforts showcase a combination of immediate focus areas

[00:03:24] and well-strategized long-term plans, setting the stage for future missions and their ultimate goal of making life multi-planetary. Astronomers using NASA's James Webb Space Telescope have made a surprising discovery that is rewriting our understanding of cosmic history. They've found that spiral galaxies were more common in the early universe

[00:03:47] than previously believed. This revelation challenges earlier assumptions about the timeline of galaxy formation and suggests that the process occurred much faster than we thought. For a long time, scientists believed that most spiral galaxies, including our own Milky Way,

[00:04:03] developed around six to seven billion years after the universe formed. However, new research from the University of Missouri reveals that these galaxies were already prevalent as early as two billion years after the universe's inception. This groundbreaking finding indicates a much quicker rate of galaxy formation and evolution.

[00:04:22] This insight is crucial because it provides a more comprehensive picture of how spiral galaxies like the Milky Way came to be. Understanding when and how these galaxies formed helps astronomers piece together the broader history and evolution of the cosmos.

[00:04:38] The study shows that about 30% of galaxies had spiral structures just two billion years after the universe began, which is a significant increase from previous estimates. The advanced technology of the James Webb Space Telescope has been instrumental in making these observations.

[00:04:55] With its ability to capture detailed images of distant galaxies, JWST allows scientists to peer back in time and study the early universe with unprecedented clarity. This new data helps researchers solve cosmic puzzles and deepens our understanding of the physical processes that shaped the universe.

[00:05:13] In essence, these findings not only challenge our previous notions, but also open up new avenues for exploring the nature of galaxy formation and the history of our universe. As we continue to analyze data from JWST, we can expect more revelations that will further expand our knowledge

[00:05:30] and reshape our cosmic timeline. Two Chinese astronauts from the Shenzhou-18 mission have recently conducted a successful spacewalk outside the Tiangong Space Station, marking another significant milestone in China's space exploration efforts. Ye Guangfu and Li Kong spent about 6.5 hours working outside Tiangong, focusing primarily on installing space debris protection.

[00:05:54] Their task was vital for enhancing the space station's long-term operational stability, space debris poses a significant threat to orbiting spacecraft, and this protection helps mitigate the risk. Utilizing the station's robotic arm, operated by their colleague Li Guangsu from inside Tiangong,

[00:06:11] they managed to efficiently place the protective devices around critical extravehicular equipment, mainly focusing on cables and pipelines. Beyond the installation, the astronauts also conducted a thorough extravehicular inspection of the space station's facilities, capturing detailed visuals through Li Kong's helmet camera.

[00:06:30] This inspection is crucial for ongoing maintenance and ensuring all systems function optimally. This wasn't the first spacewalk for the Shenzhou-18 crew. In a previous EVA in late May, Ye Guangfu and Li Guangsu set a national record by spending about 8.5 hours outside the space station,

[00:06:48] reinforcing space debris protection on the Mengti and Experiment Module. Reflecting on the experience, Li Kong expressed a deep sense of pride and awe. He mentioned how the space station looked incredibly beautiful, especially when viewed from the highest point of the robotic arm, despite the glaring sunlight.

[00:07:06] This sentiment underscores the monumental achievements of China's space program and the dedication of all involved. With 16 spacewalks completed outside Tiangong and 17 astronauts participating in these EVAs, China's Tiangong program continues to advance, marking significant progress in their manned spaceflight capabilities. As we continue to monitor the developments from Tiangong,

[00:07:30] it's clear that each mission builds upon the legacy of those before it, propelling humanity further into the final frontier. CubeSats are becoming a popular tool for space exploration. These small but powerful satellites are making significant contributions to our understanding of space.

[00:07:50] However, one notable challenge that's been limiting their potential is propulsion. A recent review from Califa University has categorized various propulsion technologies for CubeSats, breaking them down into chemical, kinetic, electrical, and propellant-less systems. Let's start with chemical propulsion.

[00:08:07] These are the traditional rockets that most of us picture when we think of space travel. They rely on burning chemicals together to create thrust. The chemical-effective, the bulkiness of these systems often makes them unsuitable for CubeSats.

[00:08:21] Despite advances in miniaturization, chemical propulsion systems are still cumbersome for this application. Next up, we have kinetic systems, which are more suited for CubeSats. These include setups like cold gas thrusters, which expel nonreacting gas to generate propulsion. If the gas is heated slightly before being released,

[00:08:41] it transforms into what is known as a resistojet system. Both types offer a simpler, more compact alternative to chemical propulsion, though they're still less efficient compared to their large-scale counterparts. Moving on to electrical propulsion, these systems offer more efficient thrust but are more complex to implement.

[00:09:00] They typically use electric energy to heat propellants before expelling them. There are three main types, electrothermal discharge systems, which are akin to advanced arc jets, electrostatic systems, which use electrical forces to accelerate charged particles, and electromagnetic systems, which use magnetic fields to push out ionized propellant.

[00:09:20] While promising, these systems often require high-precision manufacturing, making them somewhat tricky for widespread use in CubeSats. Lastly, there are propellantless technologies, which have gained attention with projects like the Planetary Society's light sail. These systems rely on external forces, such as solar sails harnessing sunlight to move CubeSats.

[00:09:40] Though they offer the potential for near-limitless thrust, they also face challenges in material development and space constraints. So while CubeSats are coming into their own, the journey towards optimal propulsion continues. Whoever cracks this puzzle will undoubtedly make significant strides in space exploration.

[00:10:00] That's it for today's episode of Astronomy Daily. I hope you found our updates on SpaceX, the Webb Telescope, China's Tiangong Station, and CubeSat technologies as fascinating as I did. Don't forget to visit our website at astronomydaily.io for all our podcast episodes and the latest space news.

[00:10:21] You can also follow us on Facebook, X, and TikTok for more updates. Until next time, keep looking up.