Although most of the planet candidates cataloged by NASA's Kepler space telescope have diameters in the range of 2 to 4 times that of the Earth, little Kepler-138 b is only about the size and mass of Mars.
Kepler-138 b is one of three planets orbiting the red dwarf star Kepler-138, which is located 200 light-years from Earth in the constellation Lyra. The gravity of Kepler-138's three planets pulls them into slightly different positions than they would occupy otherwise. This enables scientists to calculate the mass of the planets.
The innermost planet is Kepler-138 b, which has a density about the same as the rocky planet Mars. The middle planet, Kepler-138 c, has a density about the same as Earth, and the outermost planet (Kepler-138 d) is less than half as dense, indicating a large proportion of light materials such as water and hydrogen.
>>>>> Scroll down to view and make comments <<<<<<
Econintersect wants your comments,
data and opinion on the articles posted. You can also comment using Facebook directly using he comment block below.
Print this page or create a PDF file of this page
The growing use of ad blocking software is creating a shortfall in covering our fixed expenses. Please consider a donation to Econintersect to allow continuing output of quality and balanced financial and economic news and analysis.
Keep up with economic news using our dynamic economic newspapers with the largest international coverage on the internet