Question
These bodies begin to form when dust grains in circumstellar disks agglomerate. For 10 points each:
[10e] Name these bodies that can be detected outside of the Solar System using the radial velocity method or the transit method.
ANSWER: planets [accept exoplanets or extrasolar planets; accept protoplanets or protoplanetary disks; reject “dwarf planets”]
[10h] Images of protoplanetary disks taken by this instrument revealed that the disks have rings and gaps, which are not fully understood. This array of 66 radio telescopes is the Earth’s largest ground-based astronomy instrument.
ANSWER: ALMA [or Atacama Large Millimeter Array; or Atacama Large Millimeter/submillimeter Array; or Atacama Large Millimeter and Submillimeter Array]
[10m] Rings and gaps in protoplanetary disks could be due to these features that demarcate the distance from a star where gaseous compounds solidify. In the Solar System, one of these features for water currently lies at about 5 AU.
ANSWER: snow lines [or frost lines or ice lines]
<Other Science>
Summary
| 2023 ACF Nationals | 04/22/2023 | Y | 3 | 10.00 | 100% | 0% | 0% |
Data
| Chicago A | Georgia Tech A | 10 | 0 | 0 | 10 |
| Ohio State A | Florida A | 10 | 0 | 0 | 10 |
| Cornell A | WUSTL A | 10 | 0 | 0 | 10 |