1,721 reputation
1426
bio website ForTheScience.org
location Amsterdam, The Netherlands
age 38
visits member for 4 years, 8 months
seen Mar 21 at 7:42

Jun
5
comment Is the length of the day increasing?
the title does not really match the content. I was expecting a different discussion.
Jun
3
answered Telescopes to avoid as a beginner?
Jun
3
answered Can any telescope be used for solar observing?
Jun
2
comment A method to estimate the relative magnitude of a star using nearby stars
it was a historical, rather approximate method. Of course there are better methods today, but I fail to remember the name, and I was curious if someone remember it.
Jun
1
asked A method to estimate the relative magnitude of a star using nearby stars
Jun
1
comment What is exactly a Dobsonian, and what are the differences when compared with Schmidt-Cassegrain or Newtonian?
did you build it yourself ?
Jun
1
accepted What is exactly a Dobsonian, and what are the differences when compared with Schmidt-Cassegrain or Newtonian?
Jun
1
asked How are Cepheids used to evaluate their distance?
Jun
1
asked Why is M42 red in the pictures, but green when observed at the eyepiece?
Jun
1
asked What is exactly a Dobsonian, and what are the differences when compared with Schmidt-Cassegrain or Newtonian?
Jun
1
asked Lenses (refractor) or mirrors (reflector) telescope?
Jun
1
asked What does f/4.6 mean in a telescope and how important is this value?
Jun
1
asked Best periods to observe Magellanic Clouds?
May
31
comment Would a car tow rope withhold an adult person?
Remember a very important point. Climbing ropes are made so that they stretch and elastically absorb the stretch. This is, of course, because if you fall, a rigid rope would bring you to a sudden stop and likely break your body from the snap. Tow ropes are rigid, so your question may hold an intrinsic danger which I consider important to point out.
Feb
19
comment Decompressing gas whilst driving a turbine - where does the energy come from?
actually, to make the thing even more efficient, they could open a refrigerated storage facility in the same building.
Feb
18
asked The speed of gravity?
Feb
3
accepted Why is quicksilver (mercury) liquid at room temperature?
Feb
3
comment Why is quicksilver (mercury) liquid at room temperature?
@Georg: I thought it was the layperson name. I always call it mercury, but I assumed non-scientific people may search for quicksilver on google.
Feb
3
asked Why is quicksilver (mercury) liquid at room temperature?
Jan
27
revised Eyes open under water
added 58 characters in body