Answer:
Compare spectra obtained before and during an eclipse
Explanation:
- The passage of a planet between the star and the earth id called as a transit.
- The compassion between the spectral variation obtained from the light emitted by the planet can be used to find the presence of the exoplanet.
- The transiting planet has an atmosphere as some of the light passes from the sun and reaches the earth from the atmosphere of the planet.
- The brightness goes on decreasing as the planet passes out in an eclipse phase.
The population of Oregon which is given above may also be expressed in scientific notation as,
4 x 10^6
The magnitude of this number is the exponent of 10 in the scientific notation. Thus, the answer is letter "B. 6".
A. expanding the copra trade.