Which statement concerning black hole masses and Schwarzschild radii is not true?
A) In a binary system with a black hole, the Schwarzschild radius depends on the distance from the black hole to the companion star.
B) For black holes produced in massive star supernovae, Schwarzschild radii are typically a few to a few tens of kilometers.
C) The more massive the black hole, the larger the Schwarzschild radius.
D) Even an object as small as you could become a black hole if there were some way to compress you to a size smaller than your Schwarzschild radius.
Question 2
Which of the following observations indicates that conditions on Mars may have been suitable for life in the past?
A) Mars has polar caps made of dry ice.
B) There are dried-up riverbeds on Mars.
C) Mars has two small moons.
D) There are very large extinct volcanoes on Mars.
E) There is a very deep and long canyon that extends across Mars.
The ozone hole in September, 2003. Even as scientists verified that the rate of ozone depletion was
Gallery of Xylosandrus crassiusculus split open, with pupae and black fungus
This Black-browed Albatross has been hooked on a long-line.
Black Terra Hot Dog
Evaporation of a Black Hole