AboutPhilip Stahl Expertise I have forty years of experience in Astronomy, specifically solar and space physics. My specialties include the physics of solar flares, sunspots, including their effects on Earth and statistics as applied to astronomical investigations.
Experience Astronomy: more than forty years experience starting with construction of my own simple telescopes. Worked at university observatory in college, doing astrographic measurements. M.Phil. degree in Physics/Solar Physics and more than ten years as researcher.
Question Hello phillip,
I am a 10th grade student so this may seem a biit out of my leauge but... give me a chance. I am doing reasearch physics on the grand(universal) scale. The dilema I have run into is this: Based on Newtons Third Law "all actions have equal and opposite reactions." Where do black wholes fit into this equation and why dont they have opposites. Also...Guth Inflation theory states that for over time "starting with the big bang the universe is ever expanding and equalizing." how are there such super small super dense pieces of matter at the center of black holes.
Answer Hello,
I think you have some misconceptions - mainly concerning the physics issues, in your questions.
First, Newton's third law, which can be expressed:
F_12 = -F_12 or F_12 = F_21
is about FORCES not merely generic physical "opposites". In the notation shown, force 1 acts on force 2 with a force equal but opposite to what force 2 exerts on force 1.
The black hole, however, is not simply a "force" so the notion that one can employ Newton's third law to search for its opposite is misplaced. (Some speculations and conjectures have suggested that the "white hole" is the opposite of a black hole, but this is not based on any application of Newton's third law).
Next, Guth's inflation theory only is applicable to a certain early stage of the expansion of the universe. Its domain of applicability does not extend to black hole physics, nor can it be extrapolated. In fact, what one expects to find at the very centers of black holes are not "super small super dense pieces of matter" but rather something called a "singularity" (which you can google to learn more about).
Exercises and questioning such as you have done here, are nevertheless good to refine conceptions so better - more pertinent - questions can be asked in the future.
Be sure also, when you google "singularity" you also google "Newton's third law".
Have you taken High school physics yet? If not, it may be best to wait until you have done that before delving overly much into physics "on the grand(universal) scale".
