Instellar space has an excellently weak magnetic field of the order of $10^{-12}\;T$ can such a weak field be of any significant consequence. Explain

Question

$\begin{array}{1 1} \text{the deflection in their paths are significant } \\\text{the deflection in their paths in negligible } \\ \text{the deflection can be sometimes significant }\\ \text{ Cannot say about its significant } \end{array}$