How do we think the "hot Jupiters" around other stars were formed?
A) Many planets were formed around the star but coalesced into a single planet close in.
B) They formed as dense, rocky planets close to the star in the same orbits that they are seen today.
C) They formed as gas giants beyond the frost line and then migrated inwards.
D) They formed as gas giants close to the star in the same orbits that they are seen today.
C
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If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because
A) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact. B) of injuries suffered from direct hits of pieces of the asteroid or comet. C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer. D) the impact caused massive earthquakes worldwide.
The type of radio galaxy that reveals its motion through the intergalactic medium is called a:
A) quasar. B) dual lobe. C) bi-polar jet. D) head-tail. E) Seyfert.
What was Neptune's Great Dark Spot?
What will be an ideal response?
What is the most compelling piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?
A) a layer of sediment laid down at that time which is littered with dinosaur fossils B) dinosaur fossils are found in rock layers older than 65 million years but not younger than 65 million years C) a layer of sediment laid down at that time which is rich in the element Iridium (Ir), an element common in asteroids but less common on the Earth D) the crater from this impact can still be seen in the deserts of Arizona