Briefly explain T Tauri stars
Indicate whether the statement is true or false
T Tauri stars are protostars with about the mass of the Sun that show signs of active chromospheres as you might expect from young rapidly rotating stars with strong magnetic dynamos. T Tauri stars are also often surrounded by thick disks of gas and dust that are very bright at infrared wavelengths.
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Neutron stars are supported by _____
a. hydrogen degeneracy pressure
b. neutron degeneracy pressure
c. neutron gas pressure
d. electron degeneracy pressure
e. hydrogen gas pressure
The night sky is dark because the Universe is not infinitely old
a. True b. False Indicate whether the statement is true or false
The change in the frequency of a wave due to the motion of the source (or observer) is known as
A) the Bell effect. B) the Mach effect. C) the Doppler effect. D) interference. E) diffraction.
Of vectors with lengths 5 m, 3 m, and 4 m, which has the greatest magnitude x component?
a. the one with length 5 m b. the one with length 3 m c. the one with length 4 m d. It could be any of the three.