Venus
21 questions tagged Venus — spanning every one of the seven Ws.
Why is Venus called Earth's twin?
Venus is called Earth's twin because it is almost the same size, mass and rocky make-up as Earth — but its surface is a crushing, scorching hothouse.
Why is Venus hotter than Mercury even though Mercury is closer to the Sun?
Venus traps heat far more effectively than Mercury because of its thick carbon dioxide atmosphere and runaway greenhouse effect. Mercury has almost no atmosphere, so it cannot hold heat in the same way.
Why does Venus have phases like the Moon?
Venus orbits the Sun inside Earth’s orbit, so we see different amounts of its sunlit side over time. That makes it go through crescent, half, and gibbous phases.
When was the first spacecraft to land on Venus?
Venera 7 landed on Venus on 15 December 1970. It was the first spacecraft to make a soft landing on another planet and transmit data back.
When was the first spacecraft to orbit Venus?
Venus was first orbited by Mariner 5’s flyby? No orbit came later: the first successful Venus orbiter was Venera 9 in 1975?
When was the first spacecraft to visit Venus launched?
The Soviet probe Venera 1 launched in 1961 and became the first spacecraft sent toward Venus.
Whose spacecraft first landed on Venus and sent back data from the surface?
The Soviet Venera program achieved the first successful Venus landings, beginning with Venera 7 in 1970. Venera 7 sent the first data from Venus’s surface.
Whose observations first found that Venus goes through phases?
Galileo Galilei observed the phases of Venus in 1610. The full set of phases provided strong evidence that Venus orbits the Sun.
How does Venus stay hotter than Mercury even though it is farther from the Sun?
Venus is kept scorching by a runaway greenhouse effect from its dense carbon-dioxide atmosphere. Its surface temperature is about 465°C, hot enough to melt lead.
How do scientists know that Venus rotates backward so slowly?
They track cloud patterns with radar and spacecraft observations. Venus takes about 243 Earth days to rotate once, and it rotates in the opposite direction to most planets.
Which planet has the most extreme atmospheric pressure at the surface?
Venus has by far the highest surface pressure of any rocky planet, about 92 times Earth's. Its atmosphere is thick enough to crush a human spacecraft quickly.
Whose mission first soft-landed on Venus?
The Soviet Venera 7 mission achieved the first successful soft landing on another planet, Venus, in 1970. It transmitted data for about 23 minutes from the surface.
Whose discovery showed that Venus has phases like the Moon, helping confirm that it orbits the Sun?
That discovery is credited to Galileo Galilei. In 1610, his telescope showed that Venus goes through a full set of phases.
Whose spacecraft was the first to survive a landing on Venus and transmit data from the surface?
That was the Soviet Venera 7 mission. It landed on Venus on 15 December 1970 and sent data back for about 23 minutes.
How can Venus be hotter than Mercury even though Mercury is closer to the Sun?
Venus is hotter because its thick carbon-dioxide atmosphere traps heat with a runaway greenhouse effect, pushing surface temperatures to about 465°C.
Why does Venus spin so slowly?
Venus rotates very slowly because its spin was probably altered over time by strong solar tides and maybe giant impacts. One Venus day lasts about 243 Earth days.
Why does Venus have such thick, permanent clouds?
Venus's clouds are made mainly of sulfuric acid droplets formed from volcanic gases and sunlight-driven chemistry. The atmosphere is so dense that the cloud layer stays thick and global.
When was the first image of another planet taken from the surface of that planet?
The first image taken from the surface of another planet was sent from Venus by the Soviet Venera 9 lander on 22 October 1975.
When was the first spacecraft to land on Venus launched?
The Soviet Venera 7, the first successful Venus lander, was launched on 17 August 1970.
Where on Venus is Maxwell Montes found?
Maxwell Montes is in the northern highlands of Venus, near Ishtar Terra. It is Venus’s highest mountain range.
Whose spacecraft first measured the atmosphere of Venus directly from inside it?
The Soviet Venera 4 probe made the first direct atmospheric measurements of Venus in 1967. It showed that Venus’s atmosphere is extremely dense and mostly carbon dioxide.