As planets with a wide variety of properties are being discovered outside our solar system, astrobiologists are considering whet
her and how life could evolve on planets that might be very different from earth.One recently discovered extrasolar planet, or exoplanet, orbits a star whose mass is 0.70 times the mass of our sun.This planet has been found to have 2.3 times the earth's diameter and 7.9 times the earth's mass.For planets in this size range, computer models indicate a relationship between the planet's density and composition. Observations of this planet over time show that it is in a nearly circular orbit around its star and completes one orbit in only 9.5 days. How many times the orbital radius r of the earth around our sun is this exoplanet's orbital radius around its sun? Assume that the earth is also in a nearly circular orbit
Laser light however contains only one wavelength. This property makes lasers monochromatic, meaning of one color. Another property of lasers is that all the wavelengths are in phase, meaning they wave together. This property is called coherency. Laser light travels in the same direction, parallel to one another.
