Author Question: The dense disks of gas and dust such as those seen around the stars in Orion are sites where planets ... (Read 41 times)

mia · **on:** Jul 27, 2018

The dense disks of gas and dust such as those seen around the stars in Orion are sites where planets could be forming right now.

a. True
b. False
Indicate whether the statement is true or false

Question 2

Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________.

a. has a very large sunspot on its surface
b. is a member of an eclipsing binary star system
c. is a white dwarf
d. is a Cepheid variable
e. is periodically ejecting gas into space, every 93 hours