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th ASTA02- Lecture 7 (Jan. 29 ) - Motion of Stars The amount of proper motion shown by a star depends on its distance More distant stars tend to have smaller proper motions Can usually only measure proper motions within ab...
ASTA02- Lecture 6 (Jan. 24 ) - Distances to Stars Distance is the most important and most difficult quantity to measure in astronomy Distances are necessary for estimating: Total energy emitted by an object (Luminosity) Ma...
th ASTA02- Lecture 3 (Jan. 17 ) - Topics: Spectra - What is a spectrum? The distribution of photon energies coming from a light source Spectra are seen by passing light through a spectrograph We can tell how many photons a...
ASTA02- Lecture 3 (Jan. 15 ) th Topics - FUNDAMENTAL FORES - MATTER - SPECTRA. INTRODUCTION Light is the only signal we get from far away galaxies All interactions in nature are ruled by four fundamental forces: - Gravitat...
Ice Giants Uranus and Neptune are ice giants, with small cores of heavy elements and a deep mantle of solid water, mixed with ices and minerals. The particular blue colour of these planets is due to methane in the atmosph...
The Jovian Moons The composition of the moons of Jovian planets varies as we move from one planet to another. This is a consequence of change of temperature and the material condensed from the original solar nebula. The...
Why did Mars Change? Volcanic outgassing provided the young Mars with an atmosphere 400 times denser than Marss present atmosphere. Consequently, Mars should have had a strong green house effect in the past which in turn ...
Mars Distance from the Sun: 1.52 AU Orbital period: 1.881 Earth year Length of the Day: 24h 37m 22s Radius: 0.53 R E Mass: 0.1 M E Atmospheric Composition: 95% CO2, 2.7% N2, 1.6% Argon Surface Gravity: 0.38 Earth ...
Green House Effect It turns out that liquid water, plate tectonics, volcanism and the green house gases play a collaborative role in regulating Earths climate. Earths climate is much warmer than it should be based on its ...
Plate Tectonics The convection of mantle also gives rise to plate tectonics. The lithosphere is broken into a number of plates which oat on top of the mantle due to the convection of the mantle. Plate tectonics is the t...
Radiometric Dating The age of a planet can be estimated using radiometric dating of the radioactive components of the rocks. To nd the age of the solar system, we need a rock sample with a useful radioactive isotope. Th...
Condensation of Solids As the porto-planetary disc loses some of its heat and cools, material start to condense. The condensation of material depends on the temperature of the disc. Close to the Sun, the temperature is v...
Comets The radiation pressure as well as solar wind push gas and dust away. Due to the fact that dust and gas respond differently to radiation pressure and solar wind, the tail sometimes separates into a gas and a dust ta...
The Solar System We live in a stellar system with 8 major planets and a number of dwarf planets, as well as some left over material from the formation of the system. The planets in the solar system are divided into two ma...
Types of Orbits Newtons work made him realize that orbits come in a number of different shapes. Orbits come in 2 different types: closed and open. To understand the types of orbits, we need to understand conic sections....
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