# LightSail-2

> solar sail spacecraft demonstrator

**Wikidata**: [Q96142561](https://www.wikidata.org/wiki/Q96142561)  
**Source**: https://4ort.xyz/entity/lightsail-2

## Summary
LightSail-2 is a solar sail spacecraft demonstrator developed by The Planetary Society, launched on June 25, 2019, as part of the LightSail program. It is a CubeSat-sized spacecraft designed to test solar sail propulsion technology, which uses sunlight for propulsion rather than traditional rocket fuel.

## Key Facts
- **Class**: Technology demonstration spacecraft and CubeSat
- **Mass**: 5 kilograms
- **Dimensions**:
  - Spacecraft bus: 11.3 cm × 11.3 cm × 48.7 cm
  - Solar sail: 5.6 meters in diameter
- **Operator**: The Planetary Society
- **Launch Date**: June 25, 2019, at 06:30 UTC
- **Launch Vehicle**: SpaceX Falcon Heavy (boosters B1057, B1052.2, B1053.2)
- **Launch Site**: Kennedy Space Center Launch Complex 39A
- **Manufacturer**: Stellar Exploration, Inc.
- **Power Source**: Solar sail
- **Predecessor**: LightSail-1
- **Part of**: LightSail program and STP-2 mission
- **Cost**: $7 million
- **Country of Origin**: United States

## FAQs
### Q: What was the purpose of LightSail-2?
A: LightSail-2 was designed to demonstrate solar sail propulsion technology, which uses sunlight to propel a spacecraft without traditional rocket fuel.

### Q: How did LightSail-2 differ from its predecessor, LightSail-1?
A: LightSail-2 was an improved version of LightSail-1, featuring a larger solar sail (5.6 meters in diameter) and enhanced onboard systems to better test solar sail deployment and maneuverability.

### Q: What was the significance of LightSail-2's launch?
A: LightSail-2's successful launch marked a milestone in the development of solar sail technology, showcasing its potential for future space missions, including low-cost interplanetary travel.

### Q: How did LightSail-2 achieve propulsion?
A: LightSail-2 used the pressure of sunlight (photonic force) to accelerate, similar to how a sailboat uses wind, but with photons instead of air molecules.

### Q: What challenges did LightSail-2 face?
A: LightSail-2 faced challenges such as ensuring the solar sail deployed correctly and maintaining stable orbits while relying solely on solar radiation pressure.

## Why It Matters
LightSail-2 was a groundbreaking mission that demonstrated the feasibility of solar sail propulsion, a technology that could revolutionize space travel. By using sunlight as a propulsion method, spacecraft could potentially travel farther and faster with less fuel, making interplanetary missions more feasible. The mission also highlighted the potential for low-cost space exploration, as solar sails eliminate the need for heavy propulsion systems. LightSail-2's success paved the way for future missions that could use solar sails for deep-space exploration, including missions to study the solar system's outer planets and even interstellar travel.

## Notable For
- **First successful solar sail deployment in Earth orbit**: LightSail-2 was the first spacecraft to successfully deploy and maneuver using a solar sail in Earth's orbit.
- **Low-cost technology demonstration**: The mission showcased the potential for affordable space exploration using solar sails.
- **Innovative propulsion method**: LightSail-2 proved that solar radiation pressure could be used for spacecraft propulsion, offering a sustainable alternative to traditional rocket fuel.
- **Public-private collaboration**: The mission was a collaboration between The Planetary Society and private companies like SpaceX, demonstrating the growing role of private sector involvement in space exploration.
- **Pioneering for future missions**: LightSail-2's success laid the foundation for future missions that could use solar sails for deep-space exploration, including missions to study the solar system's outer planets and beyond.

## Body
### Overview
LightSail-2 was a 5-kilogram CubeSat designed to test solar sail propulsion technology. Launched on June 25, 2019, aboard a SpaceX Falcon Heavy rocket, it was part of the LightSail program, which aimed to demonstrate the feasibility of using sunlight for spacecraft propulsion.

### Design and Specifications
LightSail-2 had a spacecraft bus measuring 11.3 cm × 11.3 cm × 48.7 cm and a solar sail with a diameter of 5.6 meters. The sail was made of Mylar, a thin, reflective material that efficiently reflects sunlight to generate thrust.

### Mission Objectives
The primary objective of LightSail-2 was to deploy its solar sail and demonstrate controlled solar sailing in Earth's orbit. The mission aimed to test the sail's deployment mechanism, its ability to generate thrust, and its maneuverability.

### Launch and Deployment
LightSail-2 was launched as part of the STP-2 mission, alongside 24 other satellites. The spacecraft successfully deployed its solar sail on July 23, 2019, marking the first successful solar sail deployment in Earth orbit.

### Propulsion and Maneuverability
LightSail-2 used the pressure of sunlight (photonic force) to accelerate, similar to how a sailboat uses wind. The spacecraft could adjust its orbit by tilting the sail to catch more or less sunlight, demonstrating the potential for solar sail propulsion in space.

### Challenges and Achievements
Despite facing challenges such as ensuring the solar sail deployed correctly and maintaining stable orbits, LightSail-2 achieved its primary objectives. The mission provided valuable data on solar sail performance, paving the way for future missions that could use solar sails for deep-space exploration.

### Legacy and Future Missions
LightSail-2's success laid the foundation for future missions that could use solar sails for deep-space exploration, including missions to study the solar system's outer planets and beyond. The mission also highlighted the potential for low-cost space exploration, as solar sails eliminate the need for heavy propulsion systems.

```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "LightSail-2",
  "description": "solar sail spacecraft demonstrator",
  "sameAs": ["https://www.wikidata.org/wiki/Q44420", "https://secure.planetary.org/site/SPageNavigator/mission_control.html"],
  "additionalType": ["TechnologyDemonstrationSpacecraft", "CubeSat"]
}

## References

1. [Source](https://space.skyrocket.de/doc_sdat/lightsail-1.htm)
2. [Source](https://spaceflightnow.com/2019/06/25/falcon-heavy-launches-on-military-led-rideshare-mission-boat-catches-fairing/)
3. [Source](https://www.planetary.org/sci-tech/lightsail)
4. Jonathan's Space Report
5. [Source](https://www.floridatoday.com/story/tech/science/space/2019/06/25/darkness-turns-day-spacex-falcon-heavy-launches-kennedy-space-center/1554735001/)
6. [Source](https://www.nasaspaceflight.com/2019/06/spacex-falcon-heavys-stp-2-mission/)
7. [Source](https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2019036AC)