* * * in traceroute

There's two reasons for it.

1) A timeout. Although usually you'll eventually get replies in one of the rtt positions like 70 * * or something.

2) Some routers are configured to block some parts of the ICMP protocol from working (ICMP echo to be precise). This is usually to help prevent DDOS attacks etc. Traceroute depends on ICMP echo working.

Essentially, the traceroute tool can't work out the IP address so you'll get * * * for hosts that are blocked. Eventually you may get a response from other hosts so you may see responses at larger hop counts.

See the wikipedia article on traceroute. In your case, it's cause number 2 and there isn't anything you can do about it. Try running traceroute to another destination and you may get a full trace.