Recent content by KurtLudwig

From your reply, I assume that this is being done by SETI in the radio frequency band. Thanks for your answer. I am always trying to learn when reading threads on physics forums.

Thank you for your reply. I did learn something. Therefore the probability is that there is no intelligent and technically advanced life within 50 light years. So the distance has to be increased to increase the probability of finding intelligent and technically advanced life on a planet...

Of great concern is the reception of a signal from an exoplanet. Is it even possible? On Earth, how can we receive a signal by pointing a telescope at a distant star with a circling exoplanet. The star emits electromagnetic radiation in all frequencies. How powerful could the signal be - a...

I had researched the number of stars and possible exoplanets around those stars at various distances from Earth. At 5,000 light years a two way conversation would take 10,000 years. Then I set a limit for a two way communication at 100 years, more than an average person's lifetime. At...

Granted that life exists somewhere. Just by stating that are 200 billion stars in the Milky Way galaxy tends to make us believe that intelligent life is close by. We need to set a limit of 100 years to send and receive one answer. This necessary requirement will greatly reduce the possibility...

We know from Kepler's Second Law, that a line from a planet to the Sun sweeps an equal area in equal time. The planet's velocity increases when it orbits closer to the Sun. The area swept is a triangle 1/2 r v sin (theta) = constant, asserted by Kepler, based on observations by Tycho Brahe...

Thank you so much for taking the tine to answer my questions. I attempted to understand your insights article "does-gravity-gravitate", however I am not at your level. One actually has to study physics at a graduate level and take classes in General Relativity to understand. Is professor...

It is believed that gravity interacts with itself. I assume that gravity between stars increases. Does gravitational self-interaction change the galaxy's shape or increase the rotation curves of stars?

Thank you for your answers.

If electric power lines were insulated, there will be no or much less sparking between wires when poles are blown down during high winds. (I am thinking of the recent fire in Lahaina, Maui. My granddaughter barely escaped the fire. The family lost all their homes.) I had believed that...

I hope PhysicsForums will not shut out current members if they are only at the undergraduate level in physics and mathematics. In a local university library, I attempted to read in Gravitation, by Misner, Thorne and Wheeler. I will never be able to understand the mathematics of general...

Thanks for your explanations. I will go back to Wikipedia to read False vacuum decay.

I read in a book by professor Katie Mack "The End of Everything (Astrophysically Speaking) in chapter 6 titled Vacuum Decay on page 143. A graph of False Vacuum versus True Vacuum energy levels was shown. Before asking Physics Forums for a more detailed explanation, I did look up on Wikipedia...

Is it a chamber with almost all gases removed? Why is the energy level higher than a true vacuum?

MOND, as proposed by Prof. Mordecai Milgrom, is an empirical equation. It does correctly predict gravity at stars in the very weak gravitation regions in our Milky Way galaxy and correctly predicts the speeds of their rotation curves. According to Professor Alexander Deur gravitational fields...