astronomy 8 lab questions

PLEASE INCLUDE BOTH QUESTION AND ANSWER IN DOCUMENT

PHIL PLAIT: HOW TO DEFEND EARTH FROM ASTEROIDS
What happened on the “dinosaurs’ bad day”? What was the effect of this?
Does an asteroid need to hit the Earth to do damage? Why or why not?
Many science fiction movies and TV shows have depicted using a nuclear weapon to destroy asteroids. What problem does Plait see with this plan?
What is one way that we could defend Earth from asteroids? What are the drawbacks of the method?
Is the Earth prepared to ward off a potential asteroid hit? Why or why not?
THE HUBBLE DEEP FIELD ACADEMY
Follow through the activity and answer the following questions with at least one paragraph each. (You don’t need to complete the log questions mentioned in the activity.)

How do scientists estimate the number of objects in the image that they receive from the Hubble Deep Field?
What are some of the ways that scientists classify the objects that they see in the Hubble Deep Field images? What are some of the challenges scientists face when doing this?
When measuring distances, astronomers sometimes find that a small object in the sky is closer to Earth than a larger object. How can this be?
Once you get to the “Identify the HDF object” page of the activity, use the information you’ve learned to classify the object. What is the object shown? How did you determine this?

Solution Preview

PHIL PLAIT: HOW TO DEFEND EARTH FROM ASTEROIDS

What happened on the “dinosaurs’ bad day”? What was the effect of this?

A large piece of rock that was moving fifty times more than the speeds of a bullet slam into the earth six miles across. It, therefore, unconfined its energy causing a very loud explosion. A huge crater was left as it impacted the surface setting fires across the entire planet and causing a lot of dust and blocking the sun. This Washed away out 75% of all genus on earth.

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