Data centres down?

I just noticed that my page rank and everyone else pr has dissapeard due to data centers down - what is causing this?

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Data Server Current Pagerank

1 toolbarqueries.google.com Datacenter down
2 216.239.51.* (15)
3 216.239.59.* Datacenter down
4 64.233.161.* (2)
5 64.233.163.* Datacenter down
6 64.233.167.* Datacenter down
7 64.233.169.* Datacenter down
8 64.233.171.* (2)
9 64.233.179.* (2)
10 64.233.183.* (NaN)
11 64.233.185.* Datacenter down
12 64.233.187.* (2)
13 64.233.189.* Datacenter down
14 66.102.1.* (2)
15 66.102.11.* (7)
16 66.102.9.* Datacenter down
17 66.249.81.* Datacenter down
18 66.249.83.* Datacenter down
19 66.249.89.* Datacenter down
20 66.249.91.* (7)
21 66.249.93.* (2)
22 72.14.203.* (5)
23 72.14.205.* (2)
24 72.14.207.* Datacenter down
25 72.14.209.* (13)
26 72.14.211.* (2)
27 72.14.215.* (2)
28 72.14.217.* Datacenter down
29 72.14.219.* (2)
30 72.14.221.* Datacenter down
31 72.14.223.* Datacenter down
32 72.14.235.* Datacenter down
33 72.14.253.* Datacenter down

i noticed that too.... whenever i access google... maybe theres an update...