Supernova mixtures

Most of supernova-originating presolar grains, such as silicon carbide type X (SiC X) and low-density graphite, show excesses of ^28^Si. Some of them also indicate evidence for...绝大多数超新星起源的太阳前颗粒（presolar grains），例如碳化硅X型（SiC X）与低密度石墨，均表现出硅-28（²⁸Si）的丰度过剩现象。其中部分颗粒还存在……的相关证据。