How much bigger could Earth be before rockets wouldn't work? (space.stackexchange.com)

Article summary

The article discusses the maximum size of a planet where rockets could still work, with commenters exploring the theoretical limits of rocket technology and the challenges of escaping a large planet's gravity. Commenters consider the role of atmospheric conditions, the speed of sound, and the materials needed to build a sufficiently tall structure to support a rocket launch. The discussion also touches on the idea of using alternative methods, such as space elevators or photovoltaics, to escape a planet's gravity. The original article is not available, but the comments provide a range of perspectives on the topic.

Main themes

• rocket technology
• planetary escape velocity
• space colonization
• interstellar travel
• alternative propulsion methods
• cosmological constraints

What commenters say

• Building a sufficiently tall structure could allow rockets to work on an extremely large Earth, but the materials and logistics would be a significant challenge.
• The speed of sound in a material limits the speed at which a push or force can propagate, and this affects the design of rockets and other structures.
• Some commenters argue that colonizing other star systems may not be a viable or desirable goal, given the vast distances and resources required.
• Others propose that automated probes and terraforming could be used to collect resources and establish a human presence in other star systems, potentially using AI and Von Neumann machines.
• The dark forest hypothesis is mentioned as a possible explanation for the lack of evidence of intelligent life elsewhere in the galaxy, suggesting that advanced civilizations may be avoiding detection.
• The idea of a universal speed limit, such as the speed of light, is seen as a fundamental constraint on the possibility of faster-than-light travel and colonization.
• The discussion also raises questions about the long-term survival and expansion of human civilization, and the potential risks and benefits of exploring and settling other star systems.
• Some commenters are skeptical about the idea of colonizing other star systems, citing the difficulties and costs of interstellar travel and the potential risks of resource depletion and conflict.