// ORBITAL LOGISTICS AND PROPULSION TERM
Main Sequence
The main sequence is the stage in a star's life where it fuses hydrogen into helium in its core, like our Sun, and is in a stable phase.
TECHNICAL DEFINITION
The main sequence is the continuous and distinctive band of stars appearing on plots of stellar luminosity versus surface temperature (Hertzsprung-Russell diagram), representing the stable phase where stars primarily fuse hydrogen into helium in their cores.
BACKGROUND
The RS-25, also known as the Space Shuttle Main Engine (SSME), is a liquid-fuel cryogenic rocket engine that was used on NASA's Space Shuttle and is used on the Space Launch System.
READ MORE ON WIKIPEDIASYNONYMS & ALIASES
- Stellar main sequence
- Hydrogen-burning phase
- HR diagram
- Stable star phase
USAGE NOTE
Our Sun is currently a main sequence star.
DEVELOPERS
Organizations developing technology related to Main Sequence.
Develops and operates advanced reusable rockets and spacecraft, providing foundational access to space and critical satellite communication infrastructure for the global space economy.
Developing a range of reusable launch vehicles, rocket engines, and lunar landers, establishing core capabilities for human spaceflight and future space infrastructure.
Provides reliable and cost-efficient space launch services for critical national security, civil, and commercial payloads, forming a fundamental pillar of access to space.
A leading provider of Earth observation satellites, robotic space systems, and geospatial intelligence, offering foundational data and infrastructure for a wide array of space economy applications.
A major European player in spacecraft manufacturing, launch vehicle development, and space services, providing essential building blocks and systems for global space missions.
Develops and manufactures satellites, launch vehicles, and advanced space systems for national security and civil customers, contributing fundamental components to space exploration and defense.
Specializes in small satellite launch services (Electron) and satellite manufacturing (Photon), enabling accessible and routine space deployment for a rapidly growing segment of the space economy.
Operates the largest constellation of Earth observation satellites, providing daily imagery and insights that form a foundational data layer for numerous industries and government applications.
Pioneering the use of 3D printing for rocket manufacturing, aiming to industrialize and scale space launch capabilities through innovative production techniques, a core manufacturing innovation for the future space economy.
Developing commercial modules for the International Space Station and planning the first commercial space station, establishing foundational in-orbit infrastructure for a permanent human presence in space.