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Latest Activity: May 22
Started by Patricia Apr 11.
Started by Ruth Anthony-Gardner. Last reply by Joan Denoo Mar 26.
Started by Visvakarman Svetasvatara-Upanish. Last reply by Gerald Payne Mar 19.
Your not alone in wishing to see the northern lights first hand Patricia. I believe Copernicus never got to see Mercury. And of course Edmond Halley never witnessed the eponymous comet. I wonder if Jesus witnessed the resurrection?
With Philae now receiving twice as much solar energy as it did last November when it finally came to rest in a shaded spot on Comet 67P, the communication unit on the Rosetta orbiter has now been switched on to call the lander. Although it is probably still too cold for the lander to wake up, the prospects will improve with each passing day.
Several conditions must be met for Philae to start operating again. First, the interior of the lander must be at least at –45ºC before Philae can wake up from its winter sleep. At its new landing site – Abydos – only a little sunlight reaches Philae, and the temperatures are significantly lower than at the originally planned landing location. In addition, the lander must be able to generate at least 5.5 watts using its solar panels to wake up.
As soon as Philae ‘realises’ that it is receiving more than 5.5 watts of power and its internal temperature is above –45ºC, it will turn on, heat up further and attempt to charge its battery.
Once awakened, Philae switches on its receiver every 30 minutes and listens for a signal from the Rosetta orbiter. This, too, can be performed in a very low power state.
It could be that the lander has already woken up from its winter sleep some 500 million kilometres away from Earth, but does not yet have sufficient power to communicate with Rosetta, which relays Philae’s signal back to Earth. Philae needs a total of 19 watts to begin operating and allow two-way communication. Between 12 and 20 March, the Rosetta orbiter is transmitting to the lander and listening for a response. The most likely time for contact is during the 11 flybys where the orbiter’s path puts it in a particularly favourable position with respect to the lander during comet ‘daytime’ – when Philae is in sunlight and being supplied with power by its solar panels. Communication will be attempted continuously because Philae’s environment could have changed since landing in November 2014.
Or getting tanker trucks to haul that eastern snow over to the west!!!!
We're getting into some trouble here with the hot & dry thing. Not drought yet, but headed that way when we're not getting the usual winters.
We had a half-hour rainstorm a couple of hours ago. That was the 4th or 5th shower we've had in the last 3 months. We are in a water crisis, and nobody (so far) has done Jack Schidt about water rationing....or anything else.
I've never understood why we didn't start building desalinization plants decades ago. There a whole effing OCEAN out there!
No Felaine, its been too cloudy here. We have seen them before though when we were camping. We also saw a good show of them when we went to Saskatchewan to see our son. They are gorgeous......& noisy.
Patricia: I have always wanted to see the Northern Lights with my own eye, but never had a chance. We're WAY too far south, and it's overcast right now anyway.
Have YOU been able to see the Light Show this week?
Why are the Northern Lights burning so bright? http://globalnews.ca/video/1890786/why-are-the-northern-lights-burn...
I live in California, and Jupiter has been out for the last couple days, probably longer. I'm new to star gazing. And according to this site, I've been missing a lot more:http://earthsky.org/astronomy-essentials/visible-planets-tonight-ma...
Ok, I've made my A/N donation......your turn.
The predicted merging of Andromeda & Milky way is interesting. I'd like to be around 8 billion years from now to see it.
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