Table of Contents
How do we know the temperature of the planets?
The surface temperature of a terrestrial planet is determined by how much energy the planet receives from the Sun and how quickly it radiates that solar energy back to space. As described in a later section, a terrestrial planet’s interior temperature is determined by its size.
How can astronomers tell the temperature of a star or planetary surface?
The color of light radiated by a star reveals its temperature, and the temperature of a star determines the temperature of nearby objects such as planets. The energy of photons determines the wavelength, or color, of light; thus, the color of light emitted by an object is an indication of temperature.
How can light be used to measure the temperatures of stars?
To the extent that Stellar spectra look like blackbodies, the temperature of a star can also be measured amazingly accurately by recording the brightness in two different filters. To get a stellar temperature: Measure the brightness of a star through two filters and compare the ratio of red to blue light.
What is the measure of a star’s brightness called?
apparent magnitude
Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs.
How do astronomers measure the temperature of stars quizlet?
How do astronomers measure the temperature of stars? By looking at which absorption lines are present in the star’s spectrum. If a red giant appears the same brightness as a red main sequence star, which one is further away?
Do planets get colder farther from the Sun?
Planetary surface temperatures tend to get colder the farther a planet is from the Sun. Venus is the exception, as its proximity to the Sun and dense atmosphere make it our solar system’s hottest planet. The average temperatures of planets in our solar system are:
How do you find the expected temperature of a planet?
To find the expected temperature of a planet, you need to set the rate of energy radiated by the planet equal to the rate of energy absorbed by the planet. Using the terms in the main text above, you find
How do I choose the right values for my Planet’s climate?
You will choose values that describe how massive the nearest star is, how far away that star is from your planet, how much of the incoming starlight is reflected off the atmosphere and surface of your planet, and how much greenhouse effect is produced by your planet’s atmosphere.
How does the atmosphere affect the surface temperature of a planet?
They have preliminary evidence that the atmosphere of a planet plays a role in maintaining the surface temperature of the planet. Planets with atmospheres have higher temperatures than their gray body models predict.