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You have 5 minutes to check your Answers to the Black Hole Discussion Questions.
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You have 5 minutes to check your Answers to the Black Hole Discussion Questions 1. We could not compress the aluminum foil-covered balloon when it was inflated because the air inside the balloon was resisting the pressure we exerted upon it. Our pressure simulated gravity pulling the matter in the star toward its center and the air within the balloon simulated the outward flowing energy from thermonuclear fusion. These two factors balance each other out, so the star stays at equilibrium. 2. If a real star were the size of the balloon, then the black hole would be much, much tinier than our model black hole. A real black hole that has formed from a massive star is smaller than the tip of a pencil! 3. Building the star with more layers of gas (represented by the foil) would make the star more massive. It would also result in the formation of a more massive black hole, since there would be more material with which to form the black hole. 4. Although they have a different size, since they are made from the exact same amount of material, the model star and the model black hole have the same mass. However, since the model black hole is smaller, it has more material contained in less volume, and therefore has a higher density than the model star. This would also be true for a real black hole, which would be even smaller and much, much denser.
5. Since both the star and the black hole have essentially the same mass, but the latter had a much smaller volume, the black hole is much, much denser than the star. The same amount of matter is crammed into a much smaller space. This is true for both the model and in real life. In real life the star is much, much huger and the black hole much, much smaller, so the difference in density is even greater. 6. Black holes do not suck up nearby material. If the Sun were magically converted into a black hole, Earth's orbit would not change! Earth would continue to “fall around” the black hole, but not fall into it. However, life on Earth would cease to exist, seeing as it is dependent on the sun’s light and heat, which would no longer be emitted. More detail in case you are curious: Material generally falls into a black hole when it collides with other material orbiting the black hole. The collision alters the material's orbit. Instead of orbiting a comfortable distance from the black hole, the material is now orbiting too close to the black hole – within the boundary of its event horizon. Then the black hole's enormous gravity traps the material in a one-way spiral to oblivion. Reminder: Our sun is not massive enough to become a black hole!
What is a constellation? A group of stars that seems to form a picture Constellations
A group of stars that seems to form a picture The word “seems” is important because the stars in the constellation have no actual relationship to one another. They just look that way from our point of view, here in our solar system.
If you were in a different position relative to Orion, you wouldn’t see the same pattern at all!
Every culture since ancient times has made up their own constellations and stories to go along with them.
The International Union of Astronomers recognizes 88 “official” constellations.Most are from ancient Greek times, but some, especially those in the southern hemisphere, were made up more recently by western astronomers.These are used as a “roadmap” to the sky.
But you can also make up your own constellations, like we did in class. It’s like looking for pictures in the clouds!
Your Task: • Make a picture of your assigned constellation. • Learn the myth behind it well enough to tell it when we go into the StarLab. • Instructions in communicators! • Links on School Web Page (This Month in Science) • Ignore the Homework on the bottom, but you should each choose your own star.
