From time to time we use graphical elements from other sites that graciously allow us to do so as long as we attribute the elements to them. Below is the list of attributions.

<a href=’http://www.freepik.com/free-vector/space-rockets-collection_765129.htm’>Designed by Freepik</a>

<a href=’http://www.freepik.com/free-vector/rocket-launch_776214.htm’>Designed by Freepik</a>