4) Two particles travel along the space curves:
\[
\mathbf{r}_{1}(t)=\left\langle t, t^{2}, t^{3}\right\rangle, \quad \mathbf{r}_{2}(t)=\langle 1+4 t, 1+16 t, 1+52 t\rangle .
\]
a) Find the points ( \( x, y, z) \) at which their paths intersect (if any such points exist).
b) Do these particles ever collide? Explain