Use for discovery:

Find the mass of an exoplanet:

Get a list of exoplanets in a specified class:

Date qualifiers can accept an explicit DateObject or queries that evaluate to a DateObject:

Date qualifiers can also be specified using Dated:

Location qualifiers can accept an explicit GeoPosition, location-based Entity objects, or queries that evaluate to one of these:

The "Uncertainty" qualifier can accept several possible values and controls how uncertainty is represented in the result:

Properties that make use of the "Uncertainty" qualifier can be found with:

Create a chart showing the number of exoplanets discovered per year:

Create a chart plotting the radius versus mass:

Create a chart plotting the mass versus orbital period colored by discovery method:

Create a chart plotting the density versus radius:

Create a chart plotting the orbital eccentricity versus orbital period colored by discovery method:

Create a chart plotting the density versus radius:

For each exoplanet, find all of the other exoplanets in the system:

Gather the data based on the number of exoplanets in the system:

Plot eccentricity versus semimajor axis for systems containing one, two, or three exoplanets:

Plot radius versus orbit period on a log-log scale:

The habitable zone of an exoplanet is an ambiguous concept with no agreed-upon definition. There are several ways to go about determining what you might interpret as the habitable zone. All methods have a relation to their host star. The planetary equilibrium temperature is a form of blackbody temperature for a given planet. It does not take into account greenhouse gases or other factors that could influence habitability on a planet. You can query for planets in a given system that have a planetary equilibrium temperature between 0 and 100 Celsius:

There are other ways of determining the habitable zone, such as that described in Whitmire, D. and Reynolds, R. "Circumstellar Habitable Zones: Astronomical Considerations." In Doyle, L. (Ed.). Circumstellar Habitable Zones, Proceedings of the First International Conference. Travis House Publications, 1996: 117–142. This method allows you to determine an inner and outer radius of the habitable zone around a star: