We call the average distance from the Earth to the Sun the Astronomical Unit, or AU. Earth's average density is 5515 × 10 kg/m 3. About 2600 planetary systems have been discovered around other stars. To obtain a density you need a mass and radius. Check out Radiative flux. Another tool we can use to discover properties of an exoplanet is the light curve of the host star. Assuming you are talking about exoplanets, I'll offer this. Knowing the planet's distance from the Sun, you can make a ratio with Earth's distance and determine the solar insolation at that planet's distance. An exoplanet or extrasolar planet is a planet outside the Solar System.

An important property of a planet that tells what a planet is made of is its density. If the orbit of the planet is edge-on, so that the planet will pass in front of the star during part of its orbit, we can see this as a small decrease in the amount of light we receive. The planet’s overall density is lower than that of Earth’s, estimated at 3.933 g/cm³, and this density increases the closer one gets to the core. We used this same principle to determine the sizes of eclipsing binary stars in an earlier lab. For example, Earth's mass is about 6,000,000,000,000,000,000,000,000 kg and …
And this roughly checks in with the general consensus of Earth density at about 5.513 g/cm 3. Copernicus had the information needed to find the relative distances in AU, and Kepler used these distances to get his third law (period-squared vs. size-cubed). Earth is the fourth smallest of the planets—though in terms of the rocky planets, it's the largest—but it's the most dense.Jupiter is the largest planet in the solar system, but it's Saturn—the solar system's second largest planet—that takes the prize for least dense. We've also been given the density of water, so we can calculate the mass of the water. Let's look at Mike's planet Eris and its moon Dysmonia and see if we can compute the density of Eris. In my previous post about a floating Saturn, I hinted that I could write about the methods we can use to find the density of Saturn. Density of Venus: The second planet from our Sun, as well as the second-closest terrestrial planet, Venus has a mean density of 5.243 g/cm 3. Planets can have a wide range of sizes and masses but planets made of the same material will have the same density regardless of their size and mass.

The first possible evidence of an exoplanet was noted in 1917, but was not recognized as such. Analysis.
It is the only terrestrial planet with a liquid outer core that surrounds a solid, dense inner core.

Masses come via two methods - either measuring the radial velocity variations of the star it orbits (the bigger the RV variations, the bigger the planet mass), or so-called transit timing variations. To determine a planet’s average density, we can use (c) the transit and Doppler methods together 6. What makes Earth the densest of these planets, however, is its core. Lux is similar in that it also measures a flux per unit area, however, lux is used as a measure of the intensity, as perceived by the human eye. Mass: 5.972 × 10^25 kg Volume:5.9722 x 10^24 kg Density = Mass / Volume = 5.972 × 10^25 kg/5.9722 x 10^24 kg = 5,515.3 kg/m^3 Therefore, density of the earth is 5,515.3 kg/m^3 Find the planet's mass and diameter. Analysis. Given the mass of Earth is 5.972 × 10 24 kg, we can divide by its volume as noted above. (Use density of water = 1 g/mL) Step 1: Find the mass and volume of the salt water. Because planets are roughly spherical, calculate the volume of a sphere using the radius. Still, we can use the Kepler discoveries to extrapolate the distribution of planets in our Galaxy. In my previous post about a floating Saturn, I hinted that I could write about the methods we can use to find the density of Saturn. The mass of the salt is given, but the only the volume of water is given.

The mass of the salt and the mass of the water are both needed to find the mass of the salt water.

Since we are interested in the total loss of flux and not just the loss of flux perceived by the human eye, we choose to not use lux but flux. You can use Newton's law of gravity, the equation for centripetal acceleration, and the definition of density to determine the density of a planet. Let's look at Mike's planet Eris and its moon Dysmonia and see if we can compute the density of Eris.

The data so far imply that planets like Earth are the most common type of planet, and that there may be 100 billion Earth-size planets around Sun-like stars in the Galaxy. Then divide the mass by the volume of the sphere to get the density.

We are thus able to sometimes measure the size, density, composition, dynamical interaction and much more for transiting planets, and I remind you: all that for a planet we can’t resolve or even directly see, and only because by some pure chance they happen to cross the face of their host star as seen from Earth. Mars, the smallest of the terrestrial planets by density, is only around 70% as dense as Earth.

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