The observatory named for this constellation was recently cyberattacked, temporarily closing observatories worldwide. For 10 points each:
[10e] Name this constellation whose alpha and beta stars are named for the twins Castor and Pollux.
ANSWER: Gemini
[10h] U Geminorum is the prototypical example of a class of this type of cataclysmic variable. These binary systems consist of a white dwarf orbiting a red giant that has overflown its Roche lobe.
ANSWER: dwarf novae [or classical novae; or recurring novae; do NOT accept or prompt on ‘supernovae’ or ‘hypernovae’]
[10m] Besides being a powerful gamma-ray source in Gemini, one of these objects named Geminga is a major source of the positron excess near Earth. Jackson et al. show that Geminga exhibits glitches like other objects of this type.
ANSWER: pulsars [or magnetars; prompt on neutron stars]
<James Lasker, Other Science>