Talking about science is a good way to gather peoples of different minds to build a nice world. Here we can share scientific lessons, facts and news from different fields such as math, physics, engineering, medicine and so on...
We know very little, and yet it is astonishing that we know so much, and still more astonishing that so little knowledge can give us so much power. Bertrand Russell
HELLO MY FRIENDS :
please enrich the group by your scientific discussions and include source of the material you present in order to let others rely on what you say and also let them know about sources in which they can find more info....
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The body is the hero
Hello guys, I was chatting earlier today and someone told me that science must be considered the hero of our time mainly when it comes to our immune system. Thenceforth, I decided to post exactly what I have learned from the past few days and I hope this will help you to understand more about our body . With a circulatory system such as we have, we cartainly need protection. And it is there, a group of chemical protectors and microbial killers so quick and so powerful that, in spite of our…
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Lim ([x]+[x^2]+…+[x^100])=? (Where x→ō ) -50050100
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Imagine that we have 2 parallel lines and there are 5 points on each line.How many triangles can we make by them? 1- 1002- 2003- 1504- 300
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could you give me what your source(s) is (are) ? I m so intrested in your topic that you gave us a favour to do
thank you all for accepting my invitation...
i wish that this group helps us all improve our scientific knowledge through English...
best wishes,
Zahra...
Exactly it is usefull for me.
God luck.
thanks a million times for accepting my invitation and lightening this group ....
i hope to learn a lot from you ,my intelligent friend....
have a wonderful time:)
I am very happy to join your new group..It's very lovely..Have all my wishes to be happy ..
Your sister and friend:
Emi.
Editor's Note: This feature article is part of SPACE.com's weekly Mystery Monday series.
Pluto huggers and haters may hog the spotlight, but there's another debate on the bigger end of the planetary scale. Astronomers have in recent years uncovered super-massive objects that blur the boundary between planet and full-blown star.
The complications go beyond simply defining stars as undergoing thermonuclear fusion. Planet hunters peering at distant stars have found huge orbiting objects which dwarf Jupiter, the largest gas giant planet in our solar system. Such finds may represent the missing links on the sliding scale between planets and stars.
"Taken together, these discoveries are going to change what we call a planet," said Sara Seager, an astrophysicist at MIT. "Until now people have been arguing about how big can an object be and still be a planet."
Brown dwarfs represent the largest objects which inhabit that hazy space between planets and stars. They remain smaller than the dim red dwarf stars, but can range in size up to 70 Jupiter masses. Many simply look like failed stars which never achieved fusion, and yet some colder, smaller brown dwarfs appear more similar to gas giants such as Jupiter or Saturn.
One such brown dwarf made headlines in April 2008. The free-floating object has a mass between 15 and 30 times that of Jupiter, and represents the coolest object of its type at 660 degrees Fahrenheit (350 Celsius). Astronomers consider it a possible representative of a new class of objects, which forms yet another missing link in the overall planetary puzzle.
Going down the scale, the first-ever direct images of extrasolar planets also came late last year. They included one discovery of a three-planet system where the objects ranged from seven to 10 Jupiter masses. Another discovery involved the planet Fomalhaut b with a mass of just three Jupiter masses.
Such objects fall within the generally accepted upper limit of planets being below 13 Jupiter masses. However, the findings could still help scientists revise their planetary definitions based on how objects form, rather than just mass. Both systems contain dusty disks that reflect their young age, and also seem consistent with how planets likely formed in our solar system and elsewhere.
The existing uncertainty about large-class objects even arose during a Pluto debate held in March 2009 at the American Museum of Natural History in New York City. Seager pointed to the three-planet system as just one example of evolving scientific knowledge regarding big planets.
"No one is writing a law or rule that you have to call them this or that," Seager said, referring to the more than 300 extrasolar planets orbiting alien stars.
Perhaps this just means that scientists can take their pick of biggest known planet, if they get their definitions sorted out. But most likely know that ongoing discoveries beyond our solar system could snatch away the heavyweight title at any time.
thanks a lot for joining us here....
about the link you offered;i didn't have the patience to read the whole article through ....so let's go through it step by step ...
i found the diagram below there;let's see what each concept mean one by one...
thanks a lot for accepting my invitation...
enjoy your time here...
I am here to join your group
thanks your invitation,hope it helps to improve my English
success for you ...
-Nadiyah-
MySpace Welcome Glitter Graphics from SuperPimper.com
thanks for joining this group ...i hope that it helps us improve our English through scientific articles and lessons...
have a nice time:)
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