ATTENTION!! I have been
having trouble with my question submission form. Until it's
fixed, there is an alternate way to submit on the home page.
Also, if you submitted a question any time later than
February 15, please resubmit.
Do you have a question related to
physics? Since 1999 I have answered more than 7000 questions
on line and many more by brief email. To see how I select
questions to answer,
link here . If
you do not submit a valid email address, I will not answer
your question. Please read the
groundrules for the site. If the answer is to your
liking, please consider making a
donation to help
support this service. A history of past questions and
answers may be seen by clicking
here . I
have organized old answers into
categories
for easier searching or perusing. You may also
search the
whole site.
P olicies:
Questions which
violate
groundrules , (I do not do homework.
Please stop sending me obvious textbook
problems. Likewise, this is not a tutoring site; do
not ask me to help you with your homework. Note,
though, that many sites which advertise on this site
provide homework help or tutoring—try
here .)
I consider to be
"off
the wall" ,
are not likely to be of general interest to the
many people I know read the answers, or
do not include a valid email address,
will simply be discarded.
If your question is clearly astronomy or
astrophysics, particularly detailed questions about
black holes, stellar evolution, dark matter or dark
energy, the big bang, etc ., areas in which I am
not expert, I may not answer. If you google ask
astronomer or ask astrophysicist you will get lots of
possibilities. I recommend NASA's
Ask an Astrophysicist . Another good place is
Curious
about Astronomy?
Finally, I
am not a psychic ! Look them up,
psychic and
physicist .
I am having problems with the form I previously used
for question submissions. While I try to fix this,
you may email your question to
the_physicist@askthephysicist.com and with a
subject of NEW QUESTION. Please do not submit
homework problems.