MarkBour wrote: ↑Thu Dec 06, 2018 4:18 pm
Boomer12k wrote: ↑Thu Dec 06, 2018 5:54 am
I would try to get my own image of it, but it is too bloody cold!!!!!
Very clear...but near freezing...
Great image, and SN... Maybe someone "over there" got a really good shot of it...of course that would be about 60 million years ago...our time. And the SN Remnant is probably long dispersed... but we get to see the flash...
I was just thinking, that at a distance of 60MLyr, if someone in M77 was looking at us with a really, really strong telescope today, they might see our little Earth struck by a meteor, creating a tiny light, the Chicxulub crater, and wiping out much of the life on our planet. It would be a far less impressive event compared to what we're seeing today from M77.
Of course in M77 today, nobody is looking at that supernova. As you pointed out, Boomer, it already happened and got over with 60 million years ago. Maybe we should send them a photograph.
Well, if we think of the supernova as happening "now" (and we should), then we must also accept the possibility that someone inside M77 might be looking at M77 "now". The problem is the postal service, if we want to send the M77ans the message that we, too, have seen their supernova.
were to send them
a speed-of-light photograph, showing them our view of their supernova, the problem for them would be that our photograph would arrive at their home some 60 million years too late. Or wait, wouldn't that be 120 million years too late for them?
There it is!! Amateur astronomer Annmarie Geniusz of Duluth, Minnesota,
examines M31, the Andromeda Galaxy (upper left corner),
through 7x50 binoculars on a recent clear night. Photo: Bob King.
When I was 15 years old, I had just read about the Andromeda galaxy and realized that I could see it myself in the sky. Long story short, I grabbed my parents' binoculars and found Andromeda. I felt, extremely strongly, that there was someone inside that fuzzy yellowish splotch in the sky looking back at me, and I almost had to resist the urge to wave at them.
But then I started to work out the math. If I waved at them, the light (or whatever) from my arm and hand movement would take two million years to reach Andromeda. And then, if someone in Andromeda were to catch my wave and wave back, their wave would reach the Earth four million years after I had originally waved at them.
The postal service in space is lousy.