6

Martians could imagine a line formed by Deneb and Sadr, which have apparent magnitudes of 1.21–1.29 and 2.23 respectively (lower is brighter), compared with Polaris which varies between 1.86–2.13. This would get them a little less than 3° away from true north (compared to <0.5° for Polaris on Earth). They could also take the midpoint between Deneb and ...


5

Are there any documented cases of satellites, planes, or space stations ruining astronomical science? A similar case that comes to mind is Project Westford. In that occasion, the backlash from the scientific community started the need for scientists to participate in the planning and evaluation of outer space projects. Sir Bernard Lovell of the Jodrell ...


2

Currently, if you want to become an astronaut for a traditional space agency (i.e. NASA, ESA, Roscosmos) you basically need to be a citizen of that country or in ESA's case, a EU citizen. In the USA, the most reliable method of becoming a NASA astronaut is to be a military test pilot and eventually cross over to NASA. If you want to apply as a flight ...


2

One reason not mentioned is an accident of timing. But for an orbital coincidence, what we now call Eris might have been discovered before, or at about the same time as, Pluto. Eris has an absolute magnitude of about -1.17, versus Pluto whose absolute magnitude is -0.7. The greater absolute brightness of Eris is one reason Eris was originally thought to ...


1

The idea behind DAMPE is that, if there is something we currently think of as dark matter (and AFAIK that's a big "if", but that's only an opinion...), every now and then a so-called WIMP or Weakly Interacting Massive Particle must hit a "normal matter" particle, producing one or a few high-energy photons. In order to maximize the chances of catching a WIMP, ...


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