There's no such thing as a temperature colder than absolute zero, which is -273.15°C!
Most of the gas giants give off more heat than they receive from the sun due to their distances from the sun and the extreme temperatures of their cores. Because the core of Uranus is much cooler than the cores of the other gas giants, and because the extreme tilt between its rotational axis and its orbital plane results in large parts of the planet having periods of night that last for decades, Uranus has the lowest atmospheric temperature ever recorded in the solar system, -224° C!
(The gas giants are literally giant balls of gas, so when scientists refer to the "surface" of a gas giant they are usually referring to the area in its atmosphere where the atmospheric pressure is the same as the atmospheric pressure on Earth at sea level.)
The planet you are referring to is likely Pluto. Its surface temperature can range from about -220°C during the day to -240°C at night due to its very thin atmosphere and distance from the Sun.
During the day on Saturn, temperatures can reach around 134 degrees Celsius (274 degrees Fahrenheit) due to sunlight absorption. At night, temperatures can drop to around -185 degrees Celsius (-301 degrees Fahrenheit) as the planet radiates heat into space.
Uranus has the coldest atmosphere in our solar system, with temperatures dropping as low as -224 degrees Celsius. This is due to its distance from the Sun and its lack of internal heat sources.
The temperature of Planet X is currently unknown as it is a hypothetical planet that has not been discovered.
Mercury, the closest planet to the sun, fluctuates in temperature more than any other planet. During the day, its temperature can reach 800 degrees Fahrenheit (430 degrees Celsius), and during the night, its temperature can drop to -280 degrees Fahrenheit (-170 degrees Celsius). This is a drop of about 1,080 degrees Fahrenheit (600 degrees Celsius).
The planet with the lowest average temperature in our solar system is Uranus. Its average temperature is about -224 degrees Celsius (-371 degrees Fahrenheit).
The planet with the lowest average temperature in our solar system is Neptune. Its temperature can drop as low as -360°F (-218°C).
Technically speaking, Neptune is the planet with the lowest surface temperature; however, Neptune does not have a solid surface.
The lowest recorded temperature on Jupiter is approximately minus 235 degrees Fahrenheit (minus 148 degrees Celsius). This frigid temperature is found in the planet's upper atmosphere.
Mercury with a surface temperature of 700K in the daytime and 100K in the night
350 degrees in the day time 170 degrees in the night time
The main factor is the planet's rotation that gives day and night.
Neptune is expected to have the lowest surface temperature among Uranus, Saturn, and Neptune. This is due to Neptune's farther distance from the sun compared to Uranus and Saturn, resulting in less solar energy reaching its atmosphere.
It depends on how far away the planet is from a star. If it's close, it's hot. Also, if the planet rotates on its axis there would be a big day-night temperature difference.
The Mesosphere has the lowest temperature of the layers of Earth's atmosphere because Temperature decreases with height in the mesosphere. The mesopause, the temperature minimum that marks the top of the mesosphere, is the coldest place on Earth and has an average temperature around −100 °C (−148.0 °F; 173.1 K)
Sagittarius is a constellation in the night sky, not a physical object like a star or a planet, so it does not have a surface temperature.
The low temperature is based on the night's lowest point in temperature E.G. If the minimum on Wednesday is -4 Celsius, it is the lowest temperature point during Wednesday night (starting at sunset) until early Thursday morning (until about sunrise). The lowest point may not be mid-way as it can vary anyway as predicted weather and climate isn't always what is definitely going to be