List the three types of objects a star's core can collapse to, and give the mass limits for each
What will be an ideal response?
White dwarfs are up to 1.4 solar masses, neutron stars from 1.4 up to 3 solar masses, and black holes are over 3 solar masses and have no upper limit.
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The crust of Mars is believed to _____________ than Earth's
a. be much thinner b. be younger c. contain more water d. be more geologically active e. be much stronger
Consider this image that appears to show four identical galaxies arranged as a cross. What are we really seeing?
A) four galaxies that are nearly identical because they were born at about the same time B) four images of a single background galaxy, created by the gravitational lens of a massive foreground galaxy or cluster C) a large galaxy with four central masses that glow brightly D) a picture taken with a poorly made telescope, so that a single large object appears as four fuzzy dots.
When uranium-238 (Z = 92) is bombarded with a neutron, it can change into uranium-237
a. True b. False Indicate whether the statement is true or false
Superconductivity is lost when a certain critical temperature is exceeded
Indicate whether the statement is true or false