答案1
一种漂亮的(?)绿色扩散分子。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{fadings,shadings}
\begin{document}
\begin{tikzpicture}
\draw (0,0) circle (2cm);
\shade[ball color=green] (0,0) circle (2cm);
\draw (-2,0) arc (180:360:2 and 0.6);
\draw[dashed] (2,0) arc (0:180:2 and 0.6);
\fill[fill=black] (0,0) circle (1pt);
\foreach \i in {0,45,...,315}
{
\begin{scope}[rotate=\i]
\draw[-latex,thick] (2.1,0) -- (3,0);
\end{scope}
}
\end{tikzpicture}
\end{document}