I've just had another birthday present. I'm like the Queen, in that I have two birthdays a year. That's the only resemblance; as far as I know, she doesn't have a blog.
I was woken up by the chiming of my doorbell at 07:10 today. I'm pretty sure none of my readers will think that 07:10 is anything other than a late start to the day but I'm used to getting out of my warm bed some time between 08:00 and 08:30. For those of you shocked by that, bear in mind I am rarely in bed before midnight. Anyway, it was a courier delivering a large parcel. I hope he's getting overtime for unsocial hours.
Even at that ungodly hour, I was too inquisitive to pass up the opportunity to see what was inside the parcel. A cornucopia of delights! First of all, though, back to my warm bed for another hour's sleep. My heating doesn't come on until 07:30, after all. But I couldn't sleep, so made a cuppa and re-examined my loot.
Best of all was a card from my grandson
but also a new jigsaw puzzle. It's a Death Star - fans of Star Wars will be aware of that monstrous entity; I wish I had one in my Civilization game, I have to make do with Giant Death Robots.Most intriguing of all, the puzzle is double sided! How is that going to work, for goodness sake? I see problems ahead. Problem #2 is that it's too large for my regular puzzle table - so I have now ordered a circular table of the correct size from Mr Amazon! Don't worry, this has an upside - I can continue with Van Gogh (decent progress is being made with that, since you ask) on my puzzle table whilst setting up the Death Star on my new table.The Death Star is of course a sphere. And that set me thinking about spheres. Which I know is weird but thinking outside the box is the lifeblood of bloggers.
Now balls are spheres but you'll be relieved to know that I'm not going to talk about football. No, I am into much bigger spheres than those. Last night I watched the movie First Man, about Neil Armstrong and the years leading up to the Apollo 11 mission. It's a decent enough couple of hours if you're looking for some entertainment. Some of the time it's a bit tense, as they travel through the ionosphere and the troposphere. See, spheres! Concentrate, people.
Which of those spheres surrounding the earth is nearer to us? It's the troposphere, in which we all live. Clouds, rain, snow, that sort of stuff. The lowest part is the boundary layer, the earth's surface.
Further out from the troposphere is the stratosphere. This extends outwards a further 50km from the troposphere. The ozone in this layer absorbs ultraviolet light from the sun and prevents us from getting skin cancers and the earth from getting overheated. Or at least it would do if we weren't slowly destroying it with our nasty aerosols.
Then there's the mesosphere, thermosphere and the exosphere. I feel a home schooling science lesson coming on. Taken together, these three make up the ionosphere. It contains free electrons; without them there wouldn't be any radio waves and we couldn't hear Listen With Mother. Or use GPS.
The ionosphere is also where man made satellites orbit the earth. As of 1 April 2020, there were 2,666 of them. That sounds a lot - are they all really necessary? You'd think they would crash into each other. Want to know which countries have launched satellites? I have just the thing for you:
No-one wants to miss out, obviously.So Nigel, once we get to the edge of the exosphere, are we nearly at the moon? As you see, the exosphere stretches to around 400km above the earth. Further out, the outer regions, up to 16,000km above the earth, make up the magnetosphere. The moon, however, is 384,400km away. So no.
Thinking about the universe is why I couldn't get back to sleep at 07:15 today. I need an afternoon nap!