Why are matter and antimatter symmetric? What happened in the early universe to make matter win? Do we have any clue as to why? What do puppies have to do with it? I discuss these questions and more in today’s Ask a Spaceman!
What does ‘time’ mean for light? What is the real lesson of the twin paradox? How can we all agree on the true age of the universe? Why is it all so technical?
How and when did we realize that atoms exist? How did we learn to understand their properties? How was Ernest Rutherford hogging all the science for himself? find the answer here at #365DaysOfAstro with @PaulMattSutter
Where is the Oort Cloud and what is it made of? Why do we think some comets from there? If the Oort Cloud exists, how did it form?
What makes time so hard to understand? Why is it so different from the spatial dimensions? Is time in any way connected to that most difficult of concepts, entropy?
How much energy is needed to blow up the sun? How is this connected to the idea of binding energy? Where is all the energy in the universe?
What do brown dwarfs teach us about stars? What do they teach us about planets? What keeps them warm, and how long do they live?
What are the many sources of light in the universe? Why is a spectrum so important?