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The Astronomy thread

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Re: The Astronomy thread

Postby Sandra » Tue Sep 11, 2018 11:28 am

and something that cannot be replicated - ashes are being sent into space, some will be in the wrong place.
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Re: The Astronomy thread

Postby Grace Speaker » Tue Sep 11, 2018 04:05 pm

Sandra wrote:and something that cannot be replicated - ashes are being sent into space, some will be in the wrong place.
This makes me very cross, as it's totally irresponsible and dangerous :evil: There's already hundreds of thousands of pieces of detritus floating about up there causing a danger to the ISS, satellites and spacecraft without some daft bugger's auntie Mabel whirling about in low Earth orbit!
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Re: The Astronomy thread

Postby Sandra » Tue Sep 11, 2018 06:29 pm

Grace Speaker wrote:
Sandra wrote:and something that cannot be replicated - ashes are being sent into space, some will be in the wrong place.
This makes me very cross, as it's totally irresponsible and dangerous :evil: There's already hundreds of thousands of pieces of detritus floating about up there causing a danger to the ISS, satellites and spacecraft without some daft bugger's auntie Mabel whirling about in low Earth orbit!

I think most of them are in non-orbiting trajectories. I think James Doolan's ashes were sent towards the sun.
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Re: The Astronomy thread

Postby Grace Speaker » Mon Sep 17, 2018 07:26 pm

42 years ago toady, the new Space Shuttle was proudly showed to the public for the first time - it's name was Enterprise :D

Some of those members of the public look oddly familiar . . . :wink:

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Re: The Astronomy thread

Postby Grace Speaker » Thu Nov 22, 2018 10:47 pm

On this day 49 years ago, this photo of the Earth was taken by the crew of Apollo 12 returning from the moon

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Re: The Astronomy thread

Postby Grace Speaker » Thu Nov 29, 2018 01:27 pm

The Earth to scale with all its water and air :shock: :shock: :shock:

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Re: The Astronomy thread

Postby Sandra » Thu Nov 29, 2018 03:58 pm

I have problems with the figures behind these images. OK with the scale it wouldn't be visible but...

The atmosphere contains more fresh water than is found on the surface (atmospheric rivers alone hold more water than terrestrial rivers).

There is a huge amount hidden underground (as in rivers, aquifers etc in the crust).

Then there is so much water trapped in the mantle - does that count as 'land' or 'water'? The amount is estimated as being enough to add a mile to the sea level of the entire planet. And this is 'water' not 'water of crystallisation', this water is drawn in at subduction zones, eventually it escapes in volcanoes.

It is hard to tell when this water is counted in the figures, but cool image anyhow.
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Re: The Astronomy thread

Postby Catch-up » Mon Dec 03, 2018 09:59 pm

Love the old space shuttle picture with the familiar faces! :)
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Re: The Astronomy thread

Postby Grace Speaker » Tue Dec 04, 2018 11:10 am

Sandra wrote:I have problems with the figures behind these images. OK with the scale it wouldn't be visible but...

The atmosphere contains more fresh water than is found on the surface (atmospheric rivers alone hold more water than terrestrial rivers).

There is a huge amount hidden underground (as in rivers, aquifers etc in the crust).

Then there is so much water trapped in the mantle - does that count as 'land' or 'water'? The amount is estimated as being enough to add a mile to the sea level of the entire planet. And this is 'water' not 'water of crystallisation', this water is drawn in at subduction zones, eventually it escapes in volcanoes.

It is hard to tell when this water is counted in the figures, but cool image anyhow.
Good points, well made. I have to admit that I don't know how they calculated the scale of these either, as I can't now remember where I got this from so can't check the source data! But it does put in to perspective how tenuous our grip on life is on this planet that humanity is busy destroying
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Re: The Astronomy thread

Postby Grace Speaker » Tue Dec 04, 2018 11:14 am

Catch-up wrote:Love the old space shuttle picture with the familiar faces! :)
It's great isn't it? As an unashamed nerd and geek, I love the way that a wobbly-setted Sci Fi show from the late 60's has had such a huge influence on our culture :D
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Re: The Astronomy thread

Postby chrisboote » Tue Dec 04, 2018 01:40 pm

Grace Speaker wrote:
Catch-up wrote:Love the old space shuttle picture with the familiar faces! :)
It's great isn't it? As an unashamed nerd and geek, I love the way that a wobbly-setted Sci Fi show from the late 60's has had such a huge influence on our culture :D

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Re: The Astronomy thread

Postby Grace Speaker » Tue Dec 04, 2018 05:12 pm

chrisboote wrote:
Grace Speaker wrote:
Catch-up wrote:Love the old space shuttle picture with the familiar faces! :)
It's great isn't it? As an unashamed nerd and geek, I love the way that a wobbly-setted Sci Fi show from the late 60's has had such a huge influence on our culture :D

Communicators/Flip phones
Phasers/tasers
And soon the Tricorder ... https://en.wikipedia.org/wiki/Tricorder_X_Prize
:thumbl: Love it!
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Re: The Astronomy thread

Postby Grace Speaker » Fri Dec 07, 2018 05:32 pm

The newly arrived Mars Insight Lander has recorded the sound of Martian wind - the first sounds of wind from the surface of another planet :D I don't know why I find this so pleasing

https://www.youtube.com/watch?v=ZK5bOZx2xXs&feature=youtu.be
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Re: The Astronomy thread

Postby Squigglyx » Fri Dec 07, 2018 10:05 pm

Keep your eyes open for Comet 46P/Wirtanen.

should be visible by binoculars or telescope in about a week or so.

https://www.dailymail.co.uk/sciencetech ... -week.html

https://www.cbsnews.com/news/brightest- ... next-week/

Bright lights in the sky around Christmas, what could it mean?
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Re: The Astronomy thread

Postby Grace Speaker » Fri Dec 07, 2018 11:14 pm

Squigglyx wrote:Bright lights in the sky around Christmas, what could it mean?

The Joneses at number 52 have been at it again . . . :lol:

Extreme Christmas house lights
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