The Universe of Planet Ziggy Assignments 4, 5 and 6 for ASTR1002. Second Data Set.

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Presentation transcript:

The Universe of Planet Ziggy Assignments 4, 5 and 6 for ASTR1002. Second Data Set.

The Story Continues. You have now been on Ziggy for a week. The Xenobiologists have identified a new carniverous species: they look rather like Koalas, but drop from the “trees” on top of other animal’s heads and then devour them. Much progress has also been made in the astrophysics section. Ziggy’s sun has still not risen, but Ziggy’s moon has set, making it much easier to see faint things in the sky. There does not appear to be a Milky Way in Ziggy’s sky. Instead, you see a huge fuzzy ball, covering a quarter of the sky, which you are calling the “Milk Stain”.

The Milk Stain.

Telescope View You have now dismantled some of the USS Drongo’s telescopes and set them up outside (protected by an electric fence from the sabre-toothed bunnies). When you look anywhere in the sky you see vast numbers of stars. But when you look at any part of the Milkstain, you see vast numbers of stars packed close together. You do not see any general glow - just the light of countless stars.

Telescope view of part of the Milkstain. Telescope view of another part of the sky.

A Pulsing Star While observing one of the central regions of the Milkstain, you found several stars that seem to pulse in brightness. They take four hours to do each pulse. You remember seeing several similar star slast year, while exploring in the Canopus region. These stars also pulsed every four hours. Your telescope picks up around one photon per second from each of these stars. When you observed last year’s stars with the same telescope (from a distance of one parsec), you detected around 100 million photons per second.

The Fuzzballs While scanning the sky (away from the Milkstain) with your most powerful telescope, you kept coming across small fuzzy objects, which you are calling “fuzzballs”. They seem to be scattered pretty randomly across the whole sky. Some are bigger and brighter than others.

Some Fuzzballs.

Fuzzball Spectra. You used your best telescope to look in detail at the biggest brightest fuzzball. You also obtained a spectrum of it.

Image of the Brightest Fuzzball

Spectrum of the Nearest Fuzzball Wavelength (nm) Energy Per Unit Wavelength

A Wandering Star Another curious fact: Most of the stars you see have continued doing circles around the zenith. But two stars were recently spotted which appear to be doing something rather different…

Initial View.

Same view one hour later

Same view another hour later

What can you deduce? Once again, Captain Howard would like to hear what you’ve learned about the universe into which the alien wormhole flung you, and Ziggy’s place in this universe.