Astronomy Class Notes - Year 1
written by Ivy GreenBriar
All of my Astronomy Notes as a First Year Ravenclaw Student
Last Updated
12/12/22
Chapters
4
Reads
511
Lesson 2: Muggle-made Tools for Astronomy
Chapter 1
- Telescopes
- Optical instrument mangifying a distant object and makes them look bigger
- Earliest telescopes had two lenses at the opposite end of a tube
- Objective lens at the far end is a convex lens
- The eyepiece was concave
- Galileo improved the telescope by lessening the curve of the objective lens
- Kepler made both the eyepiece and objective lens positive lenses and these telescopes are now called astronomical telescopes
- Terrestrial telescopes are used for things here on earth and have two positive lenses in the eyepiece to keep things right-side up
- Telescopes that only use lenses are called refracting telescopes
- Reflecting telescopes use mirrors and were invented by Newton
- Making the telescope's area larger increases the light gathered and resolution
- Sky is divided into 360 degrees with each degree divided into 60 arcminutes and each arcminute divided into 60 arcseconds
- Satallites
- First satellite was Sputnik in 1957
- Four months later the USA launched Explorer 1
- Satallites can be used for communication, GPS, internet, television, and phones
- Space Shuttles
- NASA started the Space Transportation System in the early 1980s
- Was terminated in 2011
- Had two accidentents killing a total of 14 astronauts
- First women was sent into space by NASA in 1983, 20 years after Russia which had sent a women up in 1963
- The China National Space Adminstration landed a rocket on the far side of the moon
- NASA started the Space Transportation System in the early 1980s
- Radar
- Detection system that uses radio or microwaves to determine the angle, range, or velocity of objects
- Used in military, traffic control, ocean surveillance, weather monitoring, radar astronomy, and geological observations
- The Moon, Venus, Mercury, Mars, Jupiter's four biggest moons, Saturn's Rings, Titan and a few other space objects have been studied using radar
- Rovers
- Vehicle designed to move across the surface of a moon or planet
- Studies the planet or moon it is on
- Have only ever landed on the moon or Mars
