What makes the Crab Nebula pulsar unusual among other pulsars?
A) It is a magnetar, with far more intense magnetic fields than any other.
B) It is the oldest known pulsar.
C) Its period is much less regular than other pulsars.
D) It is the fastest spinning known pulsar.
E) It is relatively bright in shorter wavelengths, like visible and X-rays.
Question 2
The sketch above shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence while (c) and (d) represent only small parts of the main sequence.
Which group represents stars that are extremely bright and emit most of their radiation as ultraviolet light?
A) a B) b C) c D) d E) e
The stability of carbon bonds makes life possible even in extreme environments
Petrolisthes elongatus, the New Zealand half crab
A shed carapace of a lady crab, part of the hard exoskeleton
The Crab Nebula, remnants of a supernova that was first observed around 1050 AD
Spotted Crab
Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b