Which of the following would I use to measure the distance across a GALAXY? A) Astronomical Unit (AU)
C) Kilometer (Km)
B) Light Year (LY)
D) Miles (mi)

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers

Can you match these to the correct definition