They are good and reliable. Hope you will like them! Hay algo que me tiene intrigado y quisiera preguntarte. Well, the strength of gravity depends on the distance between the objects. So far away objects moving further away will have less and less gravitational interaction. But it seems that close by objects which have a strong gravity link between them like the Earth and the Sun, or everything that is within our galaxy etc.
The expansion takes place where there are HUGE voids. In between clusters of galaxies. A friend and I had an argument about this recently, and he only found information which claimed that gravity was a force. Very thankful for answers! Hi Simon, Well, at our scales, gravity can very efficiently be thought of as a force, as Newton did.
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At larger scales, not anymore. Geometry takes over. Slopes and curves etc. But if we one day find what we call the graviton, which is supposedly responsible for gravity, then we could call it a force again, like the other forces of Nature. With Christophe Galfard. I must say I enjoyed the video a lot — the way you describe everything around the information paradox is simply great. I will share it with my class and definitely read your book. You should do more teachings on Youtube as you are able to explain anything smoother than any English native teacher!
Many thanks for your kind email, dear Richie! Hello Cristophe, I sent you a question in January. It was in moderation process and now disappear. Dear Samuel, Haha! My query is about nuclear fusion. As I understand it when two light nuclei collide and fuse to create a heavier nucleus, the heavier nucleus does not have as much mass as the two lighter elements did, and that the difference is given off as radiation.
If one takes Wikipedia at face value, the binding energy has mass, but this appears to be a contradiction! Dear John, thank you for your question. Mass has energy and energy has a mass equivalent. If you need less binding energy to bind a large atom than to bind two small ones, then the result of fusion is a net energy release. I started to wonder something that I hope you can help me with. It has to do with time. It would seem that we have proof of the past, and we seem to exist in this time we call the present, but I was wondering if there is any proof that the future exists?
Can you shed any light on this? Hi Ian, Many thanks for your message, and well, time, is difficult. An amazing opening paragraph …… busy reading it I had the privilege to lie on the beach of Krakatau Volcano Nature Reserve Rakata Island to look up at the stars with Anak volcano several meters away. I am a non-scientist with a keen interest in Astronomy specifically black holes, alien life and Centauri Proxima and Earth Sciences volcanoes, climate change, earthquakes and tsunamis. My questions: 1.
What do you think is the greatest disconnect between the scientific community and the general public? I have so few individuals to really share my love of astronomy with. This usually ends up in some form of frustration, because some people have a blinkered view.
Some scientists now suggest that there are parallel universes out there and one thought on it is; that this is for when we have to choose one out of two options. If so, one leaves an established life behind where perhaps it would be as if one never existed in that life. Thank you very much for your message, dear Erika, and wow, I wish I were you! But for the questions, well, answering them all would take too much time! I have about pending… All the best, Christophe.
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Sur quel sujet travaillez vous en ce moment? Bonsoir Claire, et merci beaucoup pour votre gentil message! Quantumfields are full of surprises and possibillities…. In dreams subconsciousness.
Consciousness etc. That being said, yes, quantum fields are everywhere and most certainly interact with each other, albeit in a somewhat minute way. I had a question regarding the basics of quantum mechanical entanglement. The issue then becomes uncovering what force could account for such an instantaneous change.
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Is this roughly correct so far? When I first heard about this, though, I saw it slightly differently. Perhaps while the two electrons can exist in a number of different spin states and orientations, they will only ever coexist in pairs that are properly aligned with one another i.
follow url If this is true, then measuring one electron and finding it in a specific state would necessitate that the other is in the corresponding state. It would simply be a matter of probabilities and possibilities, depending on when you decided to measure. It seems to me that no force would be required to make this possible.
Dear Kian, thank you for your question. Well, the problem with entanglement is that experiments have shown that it is a vey big mystery. But in any case, it seems there is something telling the other electron that the first one has been detected. What does that, we do not know. At the moment I aspire to be a cosmologist myself! It would be really awesome to be able to meet you one day however unlikely that may be.
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Again thank you loads! It was just amazing.
Thank you for show this amazing look of the universe. Hi Natalia, Yes!
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Do study cosmology! Now for your question: it is not a matter of understanding it, but to accept that Nature works that way. I mean your book is beautiful and your book in Turkey one of the books is the focus of interest for those interested in astronomy. Nice to be able to reach your… All Best.
Hi Christophe… I am Tasmiah.. I am so amazed by every page n what i come across.. Although i m not a science student.. I am very spiritual at heart…n i was always so mesmerised whenever i sat alone at home n suddenly the light glow in the room increased.. Another question is that i do have a tendency to look at the moon n the planets venus n jupiter mainly n i get a very strange feeling that they are intact looking back at me..
Please do let me know.. Thank you, dear Tasmiah, but there are far too many questions in your message! Also Thank you for revealing the history of the moon the way you did… It was beautiful…n now when i see the moon its like looking at that broken part of my home planet…n well, it turned out quite beautiful.. Good afternoon from Spain! I just only want to thank you to write this titanic but incredible book.
Some months ago, my father gave me a telescope; and it is since then in front of a window, not in the storage. And thank you for making me enjoying this book so much. Voici quelques mots-clefs:.
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