Recent Posts

Pages: [1] 2 3 ... 10
1
The Lounge / Re: Neat lil gyroscope vid
« Last post by boydster on Today at 09:30:39 AM »
Holy shiy is neat lil gyrocope vid an annagram for Neil Degrasse Tyson? pardon my bad language.
Is there a "V" in Neil DeGrasse Tyson's name? Find the answer to that mystery, and you'll find the answer to your query.
2
In space you are either in or out of any shade. Light just travels straight in space. So you are either completely in the shade or not in the shade, i.e. in the light, when in space.

Ignoring of course the entire galaxy of stars shining light in every direction.

Quote
The famous L2 point in space is always in the shade of the Earth blocking the Sun behind.
So the JWST at L2 will be in the shade of the Earth when looking at the end of the Universe far away. But I have never understood why I have to go to point L2 to find out. I just look out of my window on Earth to study the end of the Universe above me. Of course today it is cloudy between me and the end of the Universe, but it will clear up.

Ignoring, again, that the JWST is not located at L2, but in a halo orbit around L2, and is not in Earth's shadow.  JWST is orbiting the L2 point so that the Sun, Earth and Moon are always within a small angular distance if each other behind the telescope's field if view.
ESA/NASA tell us that the JWST orbits the Sun at the L2 point with the Earth in between all the time and that the Earth looks like a Black Hole/Disque  in front of the Sun, i.e. JWST is in the shadow of Earth all the time, when it looks at the end of the Universe in the other direction. Just looking out of my window I can see the end of the Universe in the sky above me. At night I can see billions of bright stars from my window but it is still pitch dark at the ground below me. Anyway, when the JWST otbits the Sun at the L2 point, it also orbits the L2 point itself, i.e. the JWST orbits two things at the same time, i.e. the Sun and the L2 point. But you can only orbit one thing at a time! Orbiting two things at the same time is not possible.

Wrong. All satellites orbiting the Earth are also orbiting the Sun. Just because you don't understand it doesn't mean nobody else does.
3
Back on topic, JWST is just a few hours from its L2 orbit insertion burn.
https://webb.nasa.gov/content/webbLaunch/whereIsWebb.html
The best with the L2 point is that it is 100% in the cold shade of the Sun behind planet Earth at -350F or -212C. When the JWST is hit by the Sun it warms up to +50C. Vaccum space is such a wonderful place to watch the end of the universe from.
Not completely in the shade

https://space.stackexchange.com/questions/57377/is-l2-at-a-distance-where-the-earth-totally-eclipses-the-sun
In space you are either in or out of any shade. Light just travels straight in space. So you are either completely in the shade or not in the shade, i.e. in the light, when in space.
The famous L2 point in space is always in the shade of the Earth blocking the Sun behind.
So the JWST at L2 will be in the shade of the Earth when looking at the end of the Universe far away. But I have never understood why I have to go to point L2 to find out. I just look out of my window on Earth to study the end of the Universe above me. Of course today it is cloudy between me and the end of the Universe, but it will clear up.

And heiwa proves only that he didn't read the link provided.
4
So you say I cannot see the end of the Universe from my window. I thought it was just outside far away.

For individual objects such as stars, you cant see much more than a few thousand light years away. And that would be on a night with no other light pollution. Our galaxy is 100K light years across so you aren't ever able to see ~99% of the stars here. Not without help from a telescope anyway

The furthest light you might ever see is from the Andromeda galaxy - only because you have the light of many billions of stars. But again, you cant see it if there is light pollution outside.
5
Fully stocked here.  No supply issues.
6
On most things the stock is fine.  There are some weirdly specific things that are hard to find.  One of them is distilled water.  It's gotten so scarce that I just bought a water distiller on amazon.
7
I wonder if the bare shelves are from not having enough employees to keep them stocked, or if there's something on the supply side. I'm hearing from other people that the grocery stores in town are kind of the same. Lots of certain things, but empty shelves for other things.

It's similar here. It's supply chain issues from the point of origin. For example workers aren't available to pick the fruit. Truck drivers unable to drive. Lots of warehouse employees off sick and supermarket employees are also off sick. Even if they aren't the ones sick directly, if they live with someone who is, they have to stay away from work too.
8
Technology, Science & Alt Science / Re: Jwst launches in less than 3 hours
« Last post by Heiwa on Today at 08:26:02 AM »
At night I can see billions of bright stars from my window but it is still pitch dark at the ground below me.

Bullshit

That's all the stars you can see from your staring window. You dont see as much or as far as you think

And your vision that only sees in the visible light spectrum.... You miss a lot of detail and information


That is why we like to send telescopes that can detect far more information than the human eye is capable of seeing.
So you say I cannot see the end of the Universe from my window. I thought it was just outside far away.
9
What do the store shelves look like where you (any of you) live?  I ventured out of the house for some bread and milk, and the Dollar General where I live is kinda wiped out. No milk, the bread aisle was about the same, sometimes it is wiped out during normal times because it's the only store out here in the middle of nowhere. Snacks like cookies and packaged cakes were nearly wiped out.  The pet food aisle was almost bare. I think the paper products are fine, plenty of toilet paper, and paper towels. The potato chips were fully stocked. The medicine aisle had lots of empty spots.

I wonder if the bare shelves are from not having enough employees to keep them stocked, or if there's something on the supply side. I'm hearing from other people that the grocery stores in town are kind of the same. Lots of certain things, but empty shelves for other things.
10
At night I can see billions of bright stars from my window but it is still pitch dark at the ground below me.

Bullshit

That's all the stars you can see from your staring window. You dont see as much or as far as you think

And your vision that only sees in the visible light spectrum.... You miss a lot of detail and information


That is why we like to send telescopes that can detect far more information than the human eye is capable of seeing.
Pages: [1] 2 3 ... 10