01 Vital Statistics
Why Venus feels like a twin but behaves like a furnace — the numbers behind the planet.
| Property | Value |
|---|---|
| Distance from Sun | 108.2 million km (0.72 AU) |
| Orbital period | 224.7 Earth days |
| Rotation period | 243 Earth days (retrograde — backwards) |
| Day length (solar) | 116.8 Earth days — a day is longer than a year |
| Diameter | 12,104 km (95% of Earth's) |
| Mass | 4.87 × 10²⁴ kg (81.5% of Earth's) |
| Gravity at surface | 8.87 m/s² (90% of Earth's) |
| Surface temperature | ≈ 465 °C average — hot enough to melt lead |
| Surface pressure | 92 bar — equal to 900 m underwater on Earth |
| Axial tilt | 177.4° (effectively upside-down) |
| Moons | None |
| Rings | None |
| Mean density | 5.24 g/cm³ (close to Earth's 5.51) |
| Escape velocity | 10.36 km/s |
02 Atmosphere & The Runaway Greenhouse
The most crushing, corrosive, and ironically beautiful atmosphere in the inner Solar System.
Composition
96.5% carbon dioxide, 3.5% nitrogen, with traces of sulfur dioxide and water vapor. At the cloud tops the pressure matches Earth's sea level.
Greenhouse Effect
CO₂ traps heat so efficiently that Venus is hotter than Mercury, despite receiving only a quarter of the sunlight. Average: 465 °C, night and day.
Acid Rain
Clouds of sulfuric acid drift 45–65 km up. Rain forms but evaporates before reaching the ground — a cycle of acid "virga" in the upper haze.
Super-Rotation
The cloud deck circles the planet in ~4 Earth days, 60× faster than the surface rotates. Winds reach 360 km/h at the cloud tops.
03 Surface & Terrain
Hidden below the clouds — a young, volcanic world mapped entirely by radar.
Maxwell Montes
The tallest mountain range, rising 11 km above the mean radius — higher than Everest is above sea level on Earth.
Volcanic World
Over 1,600 major volcanoes, vast lava plains and coronae — structures unique to Venus, formed by mantle upwellings.
Impact Craters
Fewer than 1,000 craters — a young surface, globally resurfaced roughly 300–500 million years ago.
No Plate Tectonics
Venus lacks Earth-style plate tectonics; its single, thick crust appears to recycle in episodic global events instead.
✨ The surface glows faintly red — hot enough that rocks emit visible light at night.
04 Exploration Timeline
From the first robotic footprints in the Solar System to modern orbiters.
- 1962 — Mariner 2 (NASA)First successful planetary flyby; confirmed the scorching surface temperature.
- 1967 — Venera 4 (USSR)First probe to enter another planet's atmosphere and transmit data during descent.
- 1970 — Venera 7First spacecraft to land on another planet and survive — barely, for 23 minutes.
- 1975 — Venera 9Returned the first photographs from the surface of another world.
- 1982 — Venera 13Survived 127 minutes on the surface; sent color panoramas of the orange-brown landscape.
- 1990–94 — Magellan (NASA)Radar-mapped 98% of the surface at 100 m resolution — the atlas still used today.
- 2006–2014 — Venus Express (ESA)Studied the atmosphere, aurora and climate; found hints of recent volcanism.
- 2015–present — Akatsuki (JAXA)Japan's orbiter, studying super-rotation and cloud dynamics from an unusual eccentric orbit.
- 2021+ — The new waveNASA's DAVINCI+ and VERITAS and ESA's EnVision are planned to revisit Venus this decade.
05 Quick Answers
The questions everyone asks about the brightest planet.
Why is Venus called the Morning Star and the Evening Star?
Its orbit lies inside Earth's, so it never strays far from the Sun in our sky. It blazes after sunset for months, then shifts to dazzling pre-dawn brilliance for months — ancient astronomers gave it two names before realizing they were the same world.
Is Venus hotter than Mercury?
Yes — by far. Mercury reaches 430 °C on its sunlit side but has no atmosphere, so nights plunge to −180 °C. Venus's thick CO₂ blanket holds a steady ~465 °C everywhere, day and night.
Why does Venus spin backwards?
Its rotation is retrograde (opposite to its orbit), likely the result of a giant impact or long-term tidal interactions with the Sun early in its history. The Sun rises in the west and sets in the east on Venus.
Could humans ever live there?
Not on the surface — 92 bar of crushing pressure, acid rain and 465 °C rule it out. A speculative idea is cloud cities at ~50 km altitude, where pressure and temperature are surprisingly Earth-like. No such habitat exists today.
Could Venus once have had oceans?
Climate models suggest Venus may have hosted liquid water for up to 2–3 billion years before the runaway greenhouse boiled it away. Verifying that history is a key goal of the upcoming DAVINCI+ mission.
Why does Venus appear so bright?
It's close to Earth and its cloud deck reflects ~70% of sunlight — the highest albedo of any planet. Combined with its proximity, that makes it the third-brightest object in our sky after the Sun and Moon.