Take a look at the
marvosym package. Amongst others it provides astronomical symbols for the planets.
Code: Select all
\documentclass[11pt,a4paper,english,twocolumn]{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{babel}
\usepackage[includeheadfoot,margin=2cm]{geometry}
\usepackage{amsmath}
\usepackage{marvosym}
\usepackage{blindtext}
\begin{document}
\blindtext[3]
\begin{equation}
\frac{0.98\,R_\text{Jupiter}}{1} \times \frac{11.209\,R_\text{Earth}}{1\,R_\text{Jupiter}} \times \frac{1\,R_\text{Sun}}{109.125\,R_\text{Earth}}
\end{equation}
\begin{equation}
\frac{0.98\,R_\text{\Jupiter}}{1} \times \frac{11.209\,R_\text{\Earth}}{1\,R_\text{\Jupiter}} \times \frac{1\,R_\text{\Sun}}{109.125\,R_\text{\Earth}}
\end{equation}
\blindtext[4]
\end{document}
This way you can shorten the equation to fit one column.
Best regards
Thorsten¹