Why do you think the Hubble Space Telescope is sometimes called a “time
machine”? (See answer)
- Why do astronomers want to study the very distant galaxies seen in the
Hubble Ultra Deep Field
- Suppose a new star is seen in the sky today. Scientists announce that
it was born on your birthday, but they saw it today for the first
time. Based on your age and the distance light travels in a year
(called a "light-year"), how far from Earth is the star?
(One light-year, converted to miles:
light-year = 5,900,000,000,000 miles = 5.9 trillion miles.
converted to kilometers:
1 light-year = 9,500,000,000,000 kilometers
= 9.5 trillion kilometers.)
- Look at the close-up from the Hubble Ultra Deep Field. All of the points of
light in the photo are galaxies. Write down three questions you would ask an astronomer
about the galaxies in this image. (See answer)