# Venera 11 and 12
**Wikidata**: [Q108752103](https://www.wikidata.org/wiki/Q108752103)  
**Source**: https://4ort.xyz/entity/venera-11-and-12

## Summary
Venera 11 and 12 were Soviet space probes and part of the Venera program, designed to explore Venus. They were launched in 1978 and successfully deployed landers to the surface of Venus, returning valuable scientific data about the planet’s atmosphere and surface conditions.

## Key Facts
- Part of the Venera program, a series of Soviet missions to Venus  
- Launched in 1978: Venera 11 on September 9, Venera 12 on September 14  
- Both probes included atmospheric descent modules and landers  
- First missions to return color images from the surface of Venus (Venera 12)  
- Classified as space probes under the broader category of unmanned robotic spacecraft  
- Country of origin: Soviet Union  
- Subclass of: space probe  
- Sitelink count: 1  
- Wikipedia language coverage: Italian  

## FAQs
### Q: What were Venera 11 and 12 designed to do?
A: Venera 11 and 12 were designed to study Venus through atmospheric entry and surface landing. They collected data on temperature, pressure, and chemical composition, and transmitted images from the surface.

### Q: When were Venera 11 and 12 launched?
A: Venera 11 was launched on September 9, 1978, and Venera 12 was launched on September 14, 1978.

### Q: What did Venera 11 and 12 achieve?
A: The missions achieved successful landings on Venus, with Venera 12 notably returning the first color images from the planet's surface. Both provided critical atmospheric and surface data.

## Why It Matters
The Venera 11 and 12 missions represented major milestones in planetary exploration during the Space Race. As part of the Soviet Union's ambitious Venera program, they expanded human understanding of Venus—a planet long shrouded in mystery due to its thick, hostile atmosphere. These missions confirmed theories about extreme surface temperatures and pressures, while also delivering the first visual documentation of the Venusian landscape. Their success demonstrated advanced engineering capabilities for interplanetary travel and atmospheric entry systems, influencing future missions throughout the solar system. The scientific data returned laid foundational knowledge for comparative planetology and contributed significantly to global efforts in space science.

## Notable For
- Among the first missions to successfully land on Venus and transmit data from its surface  
- Venera 12 returned the first color images ever taken from the surface of another planet  
- Demonstrated robust engineering capable of surviving Venus’s extreme environmental conditions  
- Provided detailed atmospheric measurements including composition, pressure, and wind speeds  
- Marked key achievements within the broader context of Cold War-era space competition between the USSR and USA  

## Body
### Mission Overview
Venera 11 and 12 were twin spacecraft developed by the Soviet Union as part of their ongoing Venera program aimed at exploring Venus. Designed to withstand the harsh environment of Venus, each mission consisted of an orbiter bus and a dedicated descent module containing instruments for atmospheric analysis and surface imaging.

### Launch and Trajectory
Both probes were launched in September 1978 using modified Molniya rockets:
- **Venera 11**: Launched on September 9, 1978
- **Venera 12**: Launched on September 14, 1978

Each followed an interplanetary trajectory toward Venus, arriving approximately three months later.

### Descent and Landing Systems
Upon reaching Venus, both probes released descent modules equipped with parachutes and heat shields to slow their fall through the dense atmosphere. Instrumentation onboard measured atmospheric properties such as temperature, pressure, and chemical composition during the descent phase.

### Scientific Payload and Results
- Atmospheric sensors recorded high surface temperatures (~460°C) and crushing atmospheric pressure (~90 times Earth’s sea level)
- Gas chromatographs analyzed the composition of the Venusian atmosphere, confirming presence of carbon dioxide and trace amounts of other gases
- Venera 12 carried a camera system that captured the first color photographs from the surface of Venus
- Data revealed a rocky, barren terrain under perpetual cloud cover

### Legacy and Impact
These missions reinforced the USSR's leadership in early planetary exploration and provided unprecedented insight into one of the least understood planets in the inner solar system. The technological innovations pioneered in these missions influenced subsequent designs for atmospheric probes and lander systems used in later Soviet and international missions.