which is the hottest planet?

Answer 1

mercury is the hottest planet

venus has the highest surface temperature

Answer 2

Surface temperatures on Mercury range from about 90 to 700 K (-180 to 430°C) , with the subsolar point being the hottest and the bottoms of craters near the poles being the coldest.

Venus has an extremely thick atmosphere, which consists mainly of carbon dioxide and a small amount of nitrogen. The pressure at the planet's surface is about 90 times that at Earth's surface—a pressure equivalent to that at a depth of 1 kilometer under Earth's oceans. The enormously CO2-rich atmosphere generates a strong greenhouse effect that raises the surface temperature to over 400 °C. This makes Venus' surface hotter than Mercury's, even though Venus is nearly twice as distant from the Sun and receives only 25% of the solar irradiance.

Venus

Answer 3

Actually Venus is the hottest planet because since it has Co2 which holds up heat in more amount due to green house effect. Layer which protects some Categories of sun rays is dissolved by Co2

Answer 4

Venus is the hottest planet because it has the thick clouds made of carbon-dioxide that trap the sunlight and so is the hottest planet.

Answer 5

Venus is the hottest planet!

Answer 6

In terms of temperatures:

The following citation states that Mercury gets hottest, up to 950F on the sunlit side, and -346F on the opposite side, with little atmosphere, primarily a thin mix of He and H.(950-346)/2 = 302.

Venus is second, because it has an atmosphere, and is less extreme, with max temp of 396F high temp, and 55F low temp. (396+55)/2 = 225.5

Simply taking an average of high and low temperatures, Mercury would win, but that doesn't account for the amount of time it spends being very hot or very cold. It is also close to having the coldest temperatures at times.


I shall avoid the paris hilton statement.


Correction: This answer bothered me a little because it was imprecise. I have found a more precise chart, from NASA. Venus wins on average temperature.

See second citation, it is still in F, but Phil Plait raises a good point about needing to cite planetary temperatures in Kelvin, on his site.

Answer 7

The surface temperature on Venus is highly uniform and is about 462° C (736 K/864° F); the surface pressure is 96 bars (compared with 1 bar for earth); the atmosphere of the planet consists of nearly all carbon dioxide (CO2). The cloud base is at 50 km (31 mi), and the cloud particles are mostly concentrated sulfuric acid. The planet has no detectable magnetic field.

That 97 percent of Venus's atmosphere is CO2 is not as strange as it might seem; in fact, the crust of earth contains almost as much in the form of limestone. About 3 percent of the Venusian atmosphere is nitrogen gas (N2). By contrast, 78 percent of earth's atmosphere is nitrogen. Water and water vapor are extremely rare on Venus. Many scientists argue that Venus, being closer to the sun, was subjected to a so-called runaway greenhouse effect, which caused any oceans to evaporate into the atmosphere. The hydrogen atoms of the water molecules could have been lost to space and the oxygen atoms to the crust. Another possibility is that Venus had very little water to begin with.

The sulfuric acid of the clouds also has its analogue on earth in a very thin haze in the stratosphere. On earth, sulfuric acid is carried down in the rain and reacts with surface materials; indeed, this so-called acid rain is damaging parts of the environment. On Venus the acid evaporates at the cloud base and can only remain in the atmosphere. The upper parts of the clouds, visible from earth and from Pioneer Venus 1, extend as haze 70 to 80 km (44 to 50 mi) above the planet surface. The clouds contain a pale yellow impurity, better detected at near-ultraviolet wavelengths. Variations in the sulfur dioxide content of the atmosphere may indicate active volcanism on the planet.

Certain cloud patterns and weather features can be discerned in the cloud tops that give some information about wind motion in the atmosphere. The upper-level winds circle the planet at 360 km/h (225 mph). These winds cover the planet completely, blowing at virtually every latitude from equator to pole. Tracking the motions of descending probes has shown that, despite the scale of these high-speed, upper-level winds, well more than half of Venus's tremendously dense atmosphere, near the planet's surface, is almost stagnant. From the surface up to 10 km (6 mi) altitude, wind speeds are only about 3 to 18 km/h (2 to 11 mph). The high-speed winds probably result from the transfer of momentum from Venus's slow-moving, massive lower atmosphere to higher altitudes where the atmosphere is less massive, so that the same momentum results in a much higher velocity.

The upper atmosphere and ionosphere have been studied in great detail by Pioneer Venus 1, which passes through them once each day. On earth this region is very hot; on Venus it is not, even though Venus is closer to the sun. Surprisingly, the night side of Venus is extremely cold. (Day-side temperatures are 40° C/104° F, compared to night-side temperatures of -170° C/-274° F.) Scientists suspect that strong winds blow from the day side toward the near vacuum that is caused by the low temperatures on the night side. Such winds would carry along light gases, such as hydrogen and helium, which are concentrated in a night-side “bulge.”

On earth the ionosphere is isolated from the solar wind by the magnetosphere. Venus lacks a magnetic field of its own, but the solar wind seems to generate an induced magnetosphere, probably by a dynamo action involving its own magnetic field.

Answer 8

Venus

Answer 9

Venus is the hottest planet because it has carbon-dioxide clouds which trap heat [greenhouse effect]

Answer 10

Mercury being close is really hot
But venus is hotter due its atmosphere and
also its day almost being equal to its year
i.e. venus takes as much time to revolve as much it takes to rotate

Note : earth was just lucky bcos probabaly life from some other source or some way started on earth reducing teh green house effect of the gases
Else the huge amount of wate on earth along with CO2 wud ave turned it to another venus

so for gods sake reduce the polution as much as possible

Answer 11

1. Mercury
2. Venus