AST251H1 Lecture Notes - Lecture 1: Polycyclic Aromatic Hydrocarbon, Cosmic Ray, Ocean Deep

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peardeer987

14 Jan 2022

School

UTSG

Department

Astronomy & Astrophysics

Course

AST251H1

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Document Summary

It is the idea that there are so many stars and planets in the universe, yet we still lack strong evidence to proof that there is life. Many planets (exoplanets) in the universe are similar to earth and are suitable for living. As far as we know, many stars and planets are even older than our sun. These older planets should have much longer time to develop life and have more advanced civilization than us do. Thus, they should also be able to explore other planets of the galaxy, including earth! No evidence shows that earth was visited by any intelligent life. Event that are significant to the story of life in the cosmos. The entire history of the cosmic, starting from billions of years ago. From massive stars explosion: o, f, na, mg, br, ne . From dying of low mass stars: li, c, n. From white dwarfs explosion: fe, mn, ti, ni, cu, zn.

Related Questions

4) According to the ancient Greeks, the Earth was the center ofthe universe and the sun, moon, stars, and planets all went aroundthe Earth. In the 1543 Copernicus proposed the heliocentric theoryof the universe in which the Earth was just another planet orbitingthe Sun and only the moon orbited the Earth.

a) What is the speed at which the Moon goes around the Earth?
b) How does the Moon's orbital acceleration compare to theacceleration of objects near the surface of the Earth?
c) What is the magnitude of the force that the Earth's gravityexerts on the Moon to keep it in orbit?
d) According to Newton's third law, all forces occur in pairs. Whatis the reaction to the Earth's gravity on the moon? Explain.

Alpha Centauri, the nearest star to our solar system, is 4.3 lightyears away. Assume that Alpha Centauri has a planet with anadvanced civilization. Professor Dhg, at the planet's AstronomicalInstitute, wants to build a telescope with which he can find out ifthere are planets orbiting the sun.
What is the minimum diameter for an objective lens that will justbarely resolve Jupiter and the sun? The radius of Jupiter's orbitis 780 million {\rm km}. Assume lambda =600\;{\rm nm} .

Which, if any, of the following statements is/are true?

1)Our galaxy, The Milky Way, is a member of The Local Group, whichis one of several groups of galaxies located in the VirgoSupercluster.
2)Most astrophysicists believe that our Solar System formed from animmense cloud of gas and dust about 4-1/2 million years ago.
3)Planets are believed to have formed by a process known asaccretion.
4)Two key elements in the Condensation Theory of PlanetaryFormation are 5)Conservation of Angular Momentum and CondensationNuclei.
6)The name of the second largest object in the Universe is TheSouthern Wall.
7)In our Solar System, the four jovian planets, Jupiter, Saturn,Uranus, and Neptune, are separated from the four terrestrialplanets, Mercury, Venus, Earth, and Mars, by the Kuiper Belt.
8)Our star, The Sun, is located on the Orion Arm, about 26,000light-years from the center of the Andromeda Galaxy.
9)It takes a photon of light about 4-1/5 years to travel from ourSolar System to the second closest star to Earth, ProximaCentauri.
10)The full range of human knowledge about our Universe spans about40 or 41 orders of magnitude on a spatial scale and about 13.7billion years on a temporal scale.
11)It takes a photon of light about 5-1/2 hours to travel from theSun to the orbit of the former planet Pluto.

AST251H1 Lecture Notes - Lecture 1: Polycyclic Aromatic Hydrocarbon, Cosmic Ray, Ocean Deep

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