# ccwebb

Senior Members

56

1. ## Dark Matter vs. Magnetism

I found the episode on youtube: https://www.youtube.com/watch?v=oq_pZub-QTc Please note time stamps: 8:16 Begins the sections about forming stars 9:25 the statement "..gravity is alone is not enough" 9:43 Talks about angular momentum. 15:57 it begins talking about galactic magnetic fields 20:42 & 24:36 It refers to energy waves moves through dust clouds creating magnetic fields.
2. ## Dark Matter vs. Magnetism

True, but the show countered this point by stating that EACH dust particle has becomes charged due to... solar winds, super novas, etc... Now the magnetism doesn't have to go as far, just to the next charged particle. Does that make sense? (Please forgive me if my verbiage is incorrect. I am trying to quote the show, and I am not a scientist myself. Just highly fascinated with it though!)
3. ## Dark Matter vs. Magnetism

I am not debating the existence of dark matter. I am wondering if the amount of dark matter is correct. The amount is based on calculating how fast the outer stars are orbiting their galaxy and what mass is required to hold them in place.; Galaxy rotation curve. (It is also calculated by the amount of gravitational lensing.) So, if magnetism is helping hold stars in place while they whip around a galaxy, then shouldn't that reduce the amount of calculated dark matter?
4. ## Dark Matter vs. Magnetism

Something along the lines of: Due to angular momentum, dust clouds are not suppose to condense into stars; The gravity isn't strong enough. However, when the magnetic field is examined of the charge dust particles a different picture comes to play. The magnetic field would be strong enough to pull the particles closer together, thus helping gravity in this case. The part with Dr. Plait was pointing out is that magnetism is responsible for keeping the spiral arms of galaxies together. Since there isn't enough visible mass to keep everything where it is, researchers looked into magnetism. They found where the magnetic field concentrated at, the dust and other material would stay there...thus an arm of the Milky Way.
5. ## Dark Matter vs. Magnetism

I just watched an amazing episode of "How the Universe Works", season 4 episode 1: Forces of Mass Construction. The episode was discussing the role of magnetism in the universe, and how it is a lot more than previously thought. There was a portion where astronomer Dr. Phil Plait stated that the shape of the Milky Way's arms are due to magnetism. Then they showed this special effects how magnetism actually prevents and creates star formation. However, I thought dark matter is the reason why galaxies don't fly apart and forms stars. So, is the theory of dark matter starting to disappear due to the discovery of magnetism on the galactic level?
6. ## Planet Formation

That makes sense. Then, we find "Hot Jupiters" just to muck everything up! I know the going theory is they formed then got trapped by their accompanying star: http://www.universetoday.com/109269/what-are-hot-jupiters/
7. ## Planet Formation

Thank you! I will defiantly look through these. The solar wind is responsible for creating the tails of comets. http://hubblesite.org/reference_desk/faq/answer.php.id=18&cat=solarsystem Also, it is believed that the solar winds are responsible for Mars' nearly lack of an atmosphere. "For clues, MAVEN will watch to see when and how gas is currently stripped off the top of the atmosphere—a process that is thought to be driven by interactions with the solar wind. “The question is whether over long periods of time this process or any of the other processes that are operating have been responsible for removing most of the gas,” ..." http://www.scientificamerican.com/article/maven-spacecraft-mars-atmosphere/ The solar wind has been clocked at over 1 million miles per hour: http://solarscience.msfc.nasa.gov/SolarWind.shtml Then you have this explanation that actual states the solar winds blowing the dust away during the formation of the early solar system. "This is called the solar wind. Radiation pressure and the solar wind in the early solar system essentially blew all the excess gas out of the inner part of the solar system. That is why the terrestrial planets are so small -- the light gases were blown away." http://www2.astro.psu.edu/users/caryl/a10/lec18_2d.html I understand that solar winds having very little affect on planetesimals, now gravity from itself or the sun can prevent it from being blown away, but it appears that solar wind does have a very strong effect on dust size particles. Which now causes me to edit my original question. Obviously planets form... How did solar wind not prevent this over the time period it take dust to form into planetesimals? The rings of our gas giants have the protection of their hosts' magnetosphere. Dust orbiting a star, does not have that protection.
8. ## Planet Formation

I came across this article that talks about how in the HL Tauri system new planets can be seen forming around the star. Then later in the article it gives a link to "Its always wind around this baby star" http://news.discovery.com/space/astronomy/revolutionary-new-view-of-baby-planets-forming-around-a-star-141106.htm http://news.discovery.com/space/astronomy/its-always-a-windy-day-around-this-baby-star-14092.htm Here is my question: Space is affected by mass, that space gets 'dimpled' by the planets thus giving us gravity. How then can dust particles and small rocks create enough of a gravity well that will prevent the solar wind from blowing it away? How can gravity, a weak force already, have any kind of influence on dust and small particles if there is a stronger force that would seem to prevent it?

10. ## With Whom You Stand?

As long as man sits on the thrown, there will always be strife. As for me, there is only one worthy enough for me to kneel down to and pledge my life to. John 14:6
11. ## Religion and the virus analogy- how true does it hold for you?

I couldn't agree more. Anything can be compared to a virus then. From clothing attire to language and even to sporting events. (The shrine of the tailgate)
12. ## expansion of space

I've always struggled with the question of 'space'. Even started 2 different threads asking questions and some amazing answers have been given. More importantly, simplified for my simple brain! I've wondered the same thing here. If you have 2 balls suspended in water, floating half way from the surface and bottom. The balls can be pushed apart, thus adding more space between them, or more water can be placed between them. Literally adding more space between them. In once case the balls are moving, the other case 'space' is moving. To be silly, Scotty from Star Trek stated that, " Imagine that! It never occurred to me to think of SPACE as the thing that was moving!" Mordred and Strange, I understand your answers. For some reason they are not making sense to me. How do we know space is expanding when we can't see the 'walls' moving away from us? We can see stuff moving from us, we can measure the volume based on what we see. But we can't see passed 46 bLy. If space is infinite, then we are missing a very big portion of the equation.

You are not naked, nor are you wearing a crown. The word used in the Greek Bible was στέφανος or "Stephanos". Meaning a wreath, or more correct a reward. And the word "take" was λαμβάνω. This does not mean to steal, or remove from someone/something or forcefully own. It means for someone to receive. As in, someone else will receive your reward. To answer the question about what we will wear: 1 Corinthians 15: 35-58 Paul the Apostle talks about how our earthly body is only a seed to our heavenly body and verse 49 states "And just as we have borne the image of the earthly man, so shall we bear the image of the heavenly man." Then look at Philippians 3:20-21. "But our citizenship is in heaven. And we eagerly await a Savior from there, the Lord Jesus Christ, who, by the power that enables him to bring everything under his control, will transform our lowly bodies so that they will be like his glorious body." I don't not know what we will be wearing physically, nor do I care. I do know that what ever form it will be in, it will be perfect, sinless.
14. ## Will this ever reach us? (question about expansion)

What... media has something wrong? Again? "Why Ike, whatever do you mean?" Good point Orodruin! I thought I understood expansion to be similar to compounding interest. For every Megaparasec the expansion is increased, again? Why would expansion not be evident until 200 million LY?
15. ## Will this ever reach us? (question about expansion)

A few days ago I read about this globular cluster of stars coming at us 'like a cannon ball'! (reporters crack me up!) According to the article, there is a cluster of 100,000 stars heading this way from 53 million light years away. They are figuring it will be here in about 17-18 million years. Now please bare with me, I might start talking out of my butt here... but if the cannon ball is traveling at 2 million MPH(according to the article), which is 894 Km/sec, isn't space expanding faster than that with these kind of distances? Expansion increase the further apart items are, right? I get the fact Andromeda Galaxy will reach us, it is only 2.5 ly away. Will this 'cannon ball' ever reach us?
16. ## Red Shift question(s) and Help

Spyman and BearofHN... thank you for explaining it so. Spyman, interesting tidbit there of 'Tired Light'. It goes to show that there is so much more to light than what we can see. My own explanation could have answered this for me. Just because it appears different (further or closer) doesn't mean it is. I teach pilots to trust their instruments, and that is exactly what scientist do. Trust their instruments. Thank you.
17. ## Red Shift question(s) and Help

Not to be a wet blanket, or maybe I am not understanding here... but NFW? I can think of the asteroid belt between earth and mars, the Oort cloud and the milky way that would be in almost every picture? Or am I missing something?
18. ## Red Shift question(s) and Help

Great point! I remember the news media being in a frenzy but once you started reading the articles... well... the truth came out. Thank you Spyman, that makes a lot of sense and does a lot to clarify. Now, to play devil's advocate, how do we know that light isn't distorted by dark matter? We've been looking at the stars for a few years now and haven't noticed the gravitational lensing until very recent. (Last year I think?) What about the expansion of space, could that stretch the light into red, yet the actual distance is a lot closer? In the flying world, I teach students that anything between your eyes and an object will make the object appear to be further away. ie: fog, dust, rain, bugs on the windscreen... what if we are simply looking through a lot of 'stuff'?
19. ## Red Shift question(s) and Help

Two questions here. The first is about the red shift of light and it came about in another thread called galaxy rotation curve. The answer I understood was, we can determine the rotational speed of galaxies by the red shift of their light. So I went to Google and stated to research red-shift which led me to my question: How do we know that light is red shifted because the light source is moving away from us and not from something else? ie: Gravity has been proven to affect light, couldn't the source be closer and simply shifted red? (Black holes, dark matter...etc) Second question, in researching red shift I came across many weird sites that claim they have proof against red shift, big bang, the Twinkie theory and so on... it gave me a headache reading them all and reminded me of traveling salesmen offering cocktails given to cure all ailments! How can someone protect themselves from science lies being wrapped with some truths? As a professional pilot I hear all the time younger pilots using terms incorrectly or distorting them to simply fit the question. How can a non-scientist, who has a fascination about 'Outer Space', not fall for some of the gimmicks out there? Thank you in advance...
20. ## Aerodynamics

Yes. There are two basic forms if drag, parasitic and induced. One is parasitic is related directly to speed while induced is inversely related. At some point you get the perfect balance between two different designs. Same with planes, trains and automobiles. At some point, it isn't cost effective to keep changing the angle or shape.

22. ## Galaxy rotation curve

Ooohh... I see. Red shift of the light is used. Thank you. In addition to your question (in which I was going to ask as well) Why does the inner parts (systems) act differently than the whole? Why would the galaxy spin/rotate different than the planets orbiting the stars inside itself?
23. ## Galaxy rotation curve

Greg, I understand what you are saying. That makes complete sense on the planetary level. However, on the galaxy level, everything is said to move at the same orbital speed. How is that possible with systems of different masses, distances and so on? (I know this eventually leads into other threads about dark matter, so I want to make sure I am clarifying my question.) How can other galaxies orbital speed be measured when there is practically no rotation during our life time? The formula above proves that if the masses or distance are different, then there should be different speeds. Yet is has been proven they entirety of a spiral galaxies (maybe others?) orbits at one speed.
24. ## Galaxy rotation curve

This still just baffles me and I was hoping it can be explained better. How do we know that an entire spiral galaxy is spinning at the same speed? I mean, we (solar system) haven't even made it one lap around the milky way yet. How can we tell that other galaxies are spinning at all? For simplicity, I was reading on Wikipedia: "...a new sensitive spectrograph that could measure the velocity curve of edge-on spiral galaxies to a greater degree of accuracy than had ever before been achieved. Together with fellow staff-member Kent Ford, Rubin announced at a 1975 meeting of the American Astronomical Society the discovery that most stars in spiral galaxies orbit at roughly the same speed." Roughly? Obviously this have been proven, but it surprised me when I learned that so much study was placed on on observation conducted within a decade. Pluto hasn't even made it a full orbit around the sun since it was discovered, yet we can see how fast a spiral galaxy is spinning? Thank you in advance for the education I so obviously need...
25. ## Did Jesus, really want a religion in his name?

I'm sorry. I was not trying to mislead you or confuse you. I was really trying to show an example where the language is different; One, when the people right there in front of the speaker was the subject of the sentence and in the other, the people in front where not the subject of the sentence. I will admit, there are many passages in The Bible which may seem misleading and/or confusing. How many times in our own lives we read/heard 'zig' when in reality it was 'zag'. Then when translations are brought into the mix... good grief... now we have debates over the meaning of 'Yom'! Now, add into the confusion on 'free will' and 'possession' things are beyond muddled up. That's why its called faith and not science. John 20:29
×