Seen this before plenty of times with simple images, like shapes and whatnot, but pretty cool with a full image.
Seen this before plenty of times with simple images, like shapes and whatnot, but pretty cool with a full image.
October 2015: Earth's Warmest Month on Record by a Huge Margin
http://www.wunderground.com/blog/Jef...-a-huge-margin
7 of the hottest months on record were this year.
NOAA's top ten warmest global monthly departures from the 20th Century average:
1) 0.98°C, Oct 2015
2) 0.91°C, Sep 2015
3) 0.89°C, Mar 2015
4) 0.88°C, Feb 2015
4) 0.88°C, Jan 2007
6) 0.87°C, Aug 2015
6) 0.87°C, Jun 2015
8) 0.86°C, Feb 1998
9) 0.85°C, May 2015
10) 0.85°C, Mar 2010
https://news.yahoo.com/video/neptune...133229940.html
Neptune-sized exoplanet may have blue skies
A couple of brothers hunting in Canada find a bald eagle stuck in a hunting trap. I'm impressed that they knew to wrap its head with a hoodie to calm it down while they pried the trap open to let it go; but not before taking a selfie with it.
http://www.iflscience.com/plants-and...e-win-internet
What's so scientific about that?Originally Posted by overpowered
Not a dig at you OP, but a dig at IFLS. That has to be one of the worst science websites on the internet. It's been verging on pure clickbait for almost two years now.
It's science because religious folks might've just killed it and offer it as a BBQ sacrifice to their gods!!!
Anyway, back to topic, I used to think dark matter may just be planets or small asteroids that's not 'visible'... or perhaps very distant new stars who's light just hasn't reached earth yet..., but dark matter could be within the solar system? Wow.
https://www.nasa.gov/feature/jpl/ear...ry-dark-matter
With sensitive enough technology, planets and asteroids will be visible in the infrared part of the spectrum.
In fact, anything warmer than absolute zero can be seen in radio light. It's just really hard to see tiny objects like planets and asteroids if they're a long way away. However if objects are grouped together in big clouds, like dust for instance, you can easily see it in infrared. Look at this cool image of dust within the Andromeda galaxy:
What we can learn from this is the distribution of dust within a spiral galaxy like Andromeda (and by extension, our own) and that will tell us where we can likely find things like rocky planets and asteroids as well, since those things are made from dust grains and particles, which in turn are made from the products of stellar fusion and supernovae. If you compare the two infrared images to the visible light image, you can see where the dust in the infrared corresponds to the darker cloudy areas in the visible light. Essentially, dust will block visible light, but emit infrared light. They call this black-body illumination, you'll be able to see it if your eyes could detect that light.
In fact, if you could see infrared at different wavelengths, the sky would look like this:
http://sci.esa.int/astrophysics/5587...data-released/
However, the dust that is visible in the Andromeda image above is far too diffuse to be able to account for the amount of missing mass that we observe, for which dark matter is an explanation.
So what am I trying to say here?
Basically, if dark matter was just 'darker than visible light' then we'd be able to see it in different wavelengths. But we don't 'see' any dark matter at all. This is because dark matter doesn't interact electromagnetically, so this makes it very hard for us to detect directly. This same force (electromagnetism) that allows us to see things using photons, also drives the interaction between objects when they come into contact with each other, so it would be impossible for us to even touch dark matter because it would pass right through our hands if we were to try and scoop it up.
But dark matter does interact gravitationally with massive objects, so one way we can 'see' dark matter is through the way it changes the behaviour of galaxies and galaxy clusters on larger scales. This can be seen beautifully in the Bullet Cluster of galaxies. A number of galactic clusters collided; the gas (which interacts) slowed down when it came in contact with other gas clouds and the dark matter (which doesn't interact, except gravitationally) passed right through the gas and other dark matter clouds without slowing down.
Maybe. Dark matter can probably be found anywhere that massive objects are found. The leading candidate for now are WIMPs: weakly interacting massive particles. If we can build a big enough particle accelerator we could probably make our own dark matter. Check back in 50 years to see how the search is coming along, and who is up for the Nobel prize.but dark matter could be within the solar system? Wow.
https://www.nasa.gov/feature/jpl/ear...ry-dark-matter
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