All stars that become supernovae will leave behind a neutron star
Indicate whether the statement is true or false
FALSE
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A brittle PMMA specimen that has a KIc of 0.7 MPa·m1/2 fractures at a tensile stress of 50 MPa. Observation of the fracture surface indicates that the fracture started at the specimen edge. Predict the length of the crack that initiated the fracture.
What will be an ideal response?
The asteroid that killed the dinosaurs exploded because
A. it was made of explosive material B. it was made out of U-235 C. it got very hot from the impact D. It didn't explode; it knocked the Earth out of its normal orbit.
The least massive main-sequence stars have a/an _____ luminosity class and a/an _____ spectral class
Fill in the blank(s) with correct word
As viewed edge-on, we can see all the spurs and branches off the arms of the Milky Way galaxy
a. True b. False Indicate whether the statement is true or false