The Secret Service categorizes all threats, online and offline alike, into one of three categories. Class 3 threats are considered the most serious, and require agents to interview the individual who issued the threat and any acquaintances to determine whether that person really has the capability to carry out the threat. Class 2 threats are considered to be serious but issued by people incapable of actually follow up on their intentions, either because they are in jail or located at a great distance from the president. And Class 1 threats are those that may seem serious at first, but are determined not to be. The overall number of threats directed at the first family that require investigation has stayed relatively steady at about 10 per day — except for the period when Obama was first elected, when the Secret Service had to follow up on roughly 50 threats per day. "That includes threats on Twitter," says Ronald Kessler, author of In the President's Secret Service. "It makes no difference to [the Secret Service] how a threat is communicated. They can't take that chance of assuming that because it's on Twitter it's less serious."
One possible explanation being discussed at DLR's Lander Control Center is that the position of Philae may have shifted slightly, perhaps by changing its orientation with respect to the surface in its current location. The lander is likely situated on uneven terrain, and even a slight change in its position – perhaps triggered by gas emission from the comet – could mean that its antenna position has also now changed with respect to its surroundings. This could have a knock-on effect as to the best position Rosetta needs to be in to establish a connection with the lander.
The current status of Philae remains uncertain and is a topic of on-going discussion and analysis. But in the meantime, further commands are being prepared and tested to allow Philae to re-commence operations. The lander team wants to try to activate a command block that is still stored in Philae's computer and which was already successfully performed after the lander's unplanned flight across to the surface to its final location. "Although the mission will now focus its scientific priority on the orbiter, Rosetta will continue attempting – up to and past perihelion – to obtain Philae science packets once a stable link has been acquired," adds Patrick Martin, Rosetta mission manager.
The workhorse of India's space program, the PSLV is on a run of 25 consecutive successful launches. First flown in 1993, the Polar Satellite Launch Vehicle, or PSLV, is by far India's most-used rocket for orbital missions – accounting for thirty of the country's 46 launches to date including Friday's.
Shades of Blue Coat.