Venera 7 — first landing on another planet
Venera 7 survived Venus's 465 °C surface for 23 minutes — the first signal ever sent from another planet's ground.
The moment of Venera 7 — first landing on another planet: https://nowsky.org/e/venera7 — opens at the right place and time, replayable, no login.
Available views: Orbit ✓ · Sky — (not visible in the sky)
The story
On 15 December 1970 the Soviet Venera 7 descended through the atmosphere of Venus and reached the surface — a 490 kg landing capsule launched on 17 August after a four-month cruise. Its parachute tore during descent, it hit harder than planned and toppled onto its side, yet through a misaligned antenna it transmitted for 23 minutes: the first radio signal ever sent from the surface of another planet.
The numbers were brutal: 465 °C and 92 atmospheres — hot enough to melt lead, the pressure of 900 m of seawater. Why Venus landers survive only tens of minutes was quantified that day. The capsule was a titanium sphere tested to 180 atmospheres to withstand it.
The signal was nearly missed. So weak after landing that it was filed as noise, the 23-minute transmission was found weeks later when the recordings were re-analysed — sent from a capsule lying on its side with its antenna pointing the wrong way.
The Venera series went on to surface photographs (Venera 9, 1975) and colour images with soil analysis (Venera 13, 1982), making Venus a Soviet specialty. The orbit replay shows the four-month cruise from Earth sliding inside the orbit of Venus.
Why it matters
Venera 7 was the first proof that a probe could reach another planet's surface and survive. Atmospheric entry, parachute braking, landing shock and transmission in an extreme environment — the checklist for every later lander was first completed that day.
Surface conditions on Venus were settled by this landing. The high temperature that Mariner 2 had inferred from microwaves in 1962 was pinned by direct thermometer at 465 °C, and 92 atmospheres made the runaway greenhouse — heat trapped by a carbon-dioxide atmosphere — a cautionary tale for Earth's climate science.
The 23 minutes are also a lesson in engineering humility. Unsure the lander would survive touchdown, the designers concentrated on measurements during descent; surface transmission was a bonus. Later Veneras extended their design life from 30 minutes to two hours.
How to watch
The remains of Venera 7 lie near 5° S, 351° E on the surface, but the cloud deck hides the ground from every telescope. The landing region appears as plains in Magellan's radar maps of the 1990s.
The orbit replay draws the trajectory from Earth on 17 August 1970 to arrival on 15 December and slows at that moment; following Venus shows the probe catching up from inside its orbit.
Select Venus in the sky view for whether it is in the dawn or dusk sky from your location, with its phase; move the time to December 1970 and Venus stands as the morning star it was at the landing.
See this for yourself — replay the moment in the orbit view
Background
Venera 4 (1967) was crushed during descent and Veneras 5 and 6 (1969) exceeded their pressure limits before reaching the ground. Each time the Soviets built a thicker capsule, and Venera 7, designed for 180 atmospheres, finally touched down.
Venera 9 returned the first surface photograph in 1975 and Venera 13 colour images and soil analysis in 1982, for eight Soviet landings in all. The United States never landed, answering with Pioneer Venus's atmospheric probes in 1978 and Magellan's radar map in 1990.
Venus is a target again in the 2020s: NASA's DAVINCI (atmospheric descent) and VERITAS (radar mapping) and ESA's EnVision plan launches in the early 2030s, and DAVINCI will be the first American entry probe since the Venera era.
Venera 7’s descent did not go to plan. After 35 minutes under parachute the canopy tore and the capsule fell the last stretch at 17 m/s, faster than intended, and the impact tipped it onto its side. The antenna therefore did not face Earth squarely, the signal dropped to one percent of normal strength and was at first filed as noise. Soviet controllers assumed the landing had failed, until weeks later a re-analysis of the recordings found 23 minutes of surface transmission. The surface temperature of 465 °C was read out of that faint signal.
FAQ
How long did it transmit from the surface?
23 minutes, from a toppled capsule with a misaligned antenna — found weeks later when the recordings were re-analysed.
How hot is the surface of Venus?
465 °C at 92 atmospheres — hot enough to melt lead, at the pressure of 900 m of seawater.
Why do Venus landers not last?
Heat and pressure. Insulation and a pressure hull only buy time; Venera 13's 127 minutes remains the record.
When is the next Venus landing?
No lander is confirmed; NASA's DAVINCI plans an atmospheric descent probe in the early 2030s.
Related
- Mariner 2 — first planetary probe
- The 2012 transit of Venus
- BepiColombo — to Mercury
- Venus — object index
- Earth — object index
Times and figures are approximate — verify with official sources when planning travel. Simulation uses J2000 mean elements.