RT @NASAKepler: It still amazes us! .@btucker22: Old graphic, but I used it for a lecture last night and it still amazes me. http://t.co/Gx…
RT @NASAKepler: It still amazes us! .@btucker22: Old graphic, but I used it for a lecture last night and it still amazes me. http://t.co/Gx…