![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
The author implies that ______.
A.
it is sometimes easier to detect supernovas by observation of the X-ray spectrum than by observation of visible wavelengths of light
B.
life on the earth is endangered by its constant exposure to radiation forces that are released by a supernova
C.
recently discovered meteorites indicate that the earth and other planets of our solar system survived the explosion of a supernova several billion years ago
D.
lighter elements are formed from heavier elements during a supernova as the heavier elements are torn apart