1,399 reputation
1520
bio website msquant.sourceforge.net
location Århus, Denmark
age 49
visits member for 3 years, 9 months
seen 2 days ago

(Last updated 2014-03-04.)

I am mostly interested in making scientifically important observations, like timing occultations of or by Solar System bodies and measuring variable stars.

I am also interested in citizen science projects and participate in some of them, like Galaxy Zoo.

I have been an amateur astronomer since 1975 and have worked at the European Space agency's (ESA) technical centre in Holland, ESTEC , on the ARISTOTELES mission, an earth gravity mapping mission.

Approximate coordinates: 55°20 N, 10°20 E


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Dec
31
suggested suggested edit on Why is a proton assumed to be always at the center while applying the Schrödinger equation?
Dec
9
revised Alcubierre warp bubble effect on gravity and space
Copy edited. Broke down the wall of text. Added some context.
Dec
9
suggested suggested edit on Alcubierre warp bubble effect on gravity and space
Dec
8
revised Interaction of external light or matter and an Alcubierre warp bubble
Added context, etc.
Dec
8
suggested suggested edit on Interaction of external light or matter and an Alcubierre warp bubble
Nov
9
awarded  Yearling
Nov
3
comment Can extra-solar gamma rays reach the Earth's surface?
The source states that the the window for indirect observations is 100 GeV to 50 TeV.
Nov
3
accepted Can extra-solar gamma rays reach the Earth's surface?
Nov
3
comment Can extra-solar gamma rays reach the Earth's surface?
Access to the book worked when I tried it today. From page 13: "The earth's atmosphere effectively blocks all electromagnetic radiation of energies greater than 10 eV. The total vertical thickness of atmosphere above sea level is 1030 g cm-2, and since the radiation length is 37.1 g cm-2, this amounts to more than 28 radiation lengths. This is true up to the energy of the highest known cosmic rays (some of which may be gamma rays)." This, I think, answers my question conclusively. May be included in the answer.
Nov
3
revised Can extra-solar gamma rays reach the Earth's surface?
Made the image inline. Applied some formatting to emphasise that there *might* be a window beyond the highest energy shown.
Oct
26
revised Where does the extra force generated by a lever come from?
Copy edited.
Oct
26
suggested suggested edit on Where does the extra force generated by a lever come from?
Sep
25
revised Frames of reference: Inertial and accelerated - and jerked, snapped, crackled and popped?
Copy edited (e.g. ref <http://english.stackexchange.com/questions/2429>, but the term for a broader audience would not be accepted).
Sep
25
comment Frames of reference: Inertial and accelerated - and jerked, snapped, crackled and popped?
Rice crispies??
Sep
25
suggested suggested edit on Frames of reference: Inertial and accelerated - and jerked, snapped, crackled and popped?
Sep
4
revised What does electroweak vacuum lifetime refer to?
Copy edited.
Sep
4
revised How can bubble universes collide in eternal inflation?
Copy edited.
Sep
4
revised How fast is a true vacuum bubble going to expand?
Copy edited.
Sep
4
revised Could the Planck energy destabilize quantum vacuum?
Copy edited (although a slight amount of interpretation went into it - esp. <http://en.wiktionary.org/wiki/harness#Verb>).
Sep
4
revised Explanation of NMOS processes
Copy edited.