Space Science (Grade 9 )

StudyBug14
Flashcards by StudyBug14, updated more than 1 year ago
StudyBug14
Created by StudyBug14 over 6 years ago
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Science (Space) Flashcards on Space Science (Grade 9 ) , created by StudyBug14 on 12/05/2014.

Resource summary

Question Answer
any object that exists in space Celestial object
a celestial object that is made up of hot gases star
a round celestial object that orbits around one or more stars planet
when an object does a 360 degree turn on its axis rotation
when an object rotates fully around another object revolution
Three pieces of evidence showing the Earth is round 1. Disappearing Ships 2. The Changing Sky 3. Earth's Curved Shadow
the first astronomers made observations ___ ago 6000 years
the process of determining the location of a point by measuring two angles at either end of a fixed baseline Triangulation
helps in triangulation by measuring the angle above the horizon astrolabe
patterns of shapes people and animals in the sky constellation
light travels the distance of ____ in a year (light year) 9.46 x 10^12 km
light travels at the speed of ____ 3 x 10^5 km/s
brightness of a star seem from Earth apparent magnitude
The North Star is also known as ____ Polaris
the pointer stars are the ___ two stars on the end of the Big Dipper
all stars move slowly ____ throughout the year westward
The earth's orbit around the Sun is ____ elliptical
The Earth's axis is tilted at an angle of ____ 23.5 degrees
Higher concentration of sunlight warmer temperature Hemisphere is facing TOWARDS the Sun
Lower concentration of sunlight Cooler temperature hemisphere is facing AWAY from the Sun
The moon orbits the Earth in about ___ 29.5 days
by the time it finishes to revolve around the earth, the moon spins ___ on its axis once
the moon's _____ and ____ are the same the moon's rotational period and orbit period are the same
the ____ of the Moon is always facing the Earth The same portion of the Moon is always facing the Earth
phases if the Moon 1. New Moon 2. Waxing Crescent 3. First Quarter 4. Waxing Gibbous 5. Full Moon 6. Waning Gibbous 7. Third Quarter 8. Waning Crescent
Waxing increasing
Waning decreasing
Gibbous the amount of light we see between half-lit and fully-lit
Crescent The amount of light we see is between half-lit and non-lit
When one celestial body passes directly in front if another Eclipse
Lunar Eclipse the moon passes through the umbra of the Earth's shadow
Happens __ a year twice, because the moon's orbit is tilted
Solar Eclipse The shadow of the Moon falls on the Earth's surface
The solar eclipse also occurs twice a year
Caused by the gravitational force between the Earth and the Moon Tides
the moon pulls at everything on Earth but only water can move.
why do we not see a solar eclipse every time the Moon is between the Sun and Earth? You have to be in a specific place, usually a very remote place, to see the solar eclipse
Far more people have seen a lunar eclipse than a solar eclipse. Why? You can see a lunar eclipse anywhere on Earth
The universe is defined as EVERYTHING!
the universe is ___ old 13.8 billion years old
1 AU is.... the distance between the Earth and the Sun, 1.5 x 10^8
Our solar system is comprised of the Sun and everything that orbits it
Planets are held in orbit by ... The Sun's gravitational pull
The Earth is moving about ___ 30km/s
The first model of the solar system Geocentric Model
The Geocentric Model states that __ is at the center and everything in the solar system orbits it Earth is at the center, as displayed in the Geocentric Model
The model that stated that everything in the solar system orbits the Sun Heliocentric Model
_____ developed the Heliocentric Theory in the ____ Copernieus developed the Heliocentric Theory in the 1500's
A planet has to meet three criteria 1. it must be round 2.., It must orbit a star 3. It must be large enough ( have enough gravitational pull) to clear it's orbit
an object that's made up of rocky materials, ice, and gas comet
where does comets come from? It comes from the Kuiper Belt and the Oort Cloud
Why do their tails always point away from the Sun, regardless of it they're travelling towards or away from it? The wind of the Sun causes the gases and particles of the comet to be pushed back, which forms a tail
piece of rock that's moving through space Meteoroid
a meteoroid that hits Earth's atmosphere and burns up Meteor
a meteoroid that passes through the Earth's atmosphere without getting totally burned Meteorite
what are shooting stars really? Meteors
Challenges of space travel - distance - costly - need food and air for long trips - need protection from extreme heat and extreme cold
Two types of space exploration -Humans - Instruments ( planetary orbiters, landers and satellites )
Telescopes can detect.... All telescopes detect electromagnetic radiation
Radiation is... Waves that travel at the speed of light
Examples of radiation are... Radio waves, light rays, rays
Optical telescopes can.. detect visible light
The two types of optical telescopes are... Refracting and Reflecting telescopes
Refracting telescopes uses... A lens to collect light from an object
Reflecting telescopes uses... a mirror to collect the light from an object
Non optical telescopes can... Detect non visible radiation
Radio waves are able to... go through clouds
you can use non optical telescopes on... a cloudy day or at night time
Radio waves are ______________ on the receiver collected and focused
A ___ amount of the radiation from space is absorbed by the Earth's atmosphere large
Telescopes are placed in ___ above the _____ placed in space, above Earth's atmosphere
Pros about telescopes in space - Can detect objects that re not otherwise visible from Earth - powered by solar energy
cons about telescopes - very expensive and difficult to repair/ upgrade - difficult to point accurately at an object ( not anchored )
Orbiters are .. - launched into space to orbit a planet or a moon
Orbiters can ... collect data and take pictures of celestial objects
cons about orbiters sometimes orbiters malfunction come too close to the celestial object and burn up in the atmosphere
Landers are planetary instruments that can't move around
Landers can.. sample data from one specific location on a celestial object
Landers can only last for a few months
Satellites are... an artificial object or vehicle that orbits Earth, the moon, or other celestial bodies
satellites are ____ because they are a important part of our daily lives because of weather reports, internet, radio and cell phones
a GPS stands for Global Positioning system
a GPS is programmed in all new smart phones
Remote - sensing satellites can... complete i orbit of the earth every 90 minutes
Scientists use the remote sensing satellite to study weather (meteorology) study the climate (climatology ) study the ocean (oceanology ) study of water (hydrology )
Satellites that are located farther away from the Earth and takes 24 hours to orbit the earth are called ... Geosynchronous Satellites
Geosynchronous Satellites are used to... broadcast television programs and satellite radios
The most important celestial object for life on earth is The Sun
The Solar System was formed from ... Gravity that set gases and dust particles into motion forming a young star called a protostar - particles gather as the spinning cloud and start joining together - Rocks and dust that didn't fall into the Sun collided with each other to forn the planets
The Solar System was also formed from ... collisions are common among spinning nnebulas - nebula forms rocky lumps called planetesimals - if planetesimals can survive collisions they form planets
Where did the Sun come from? Solar Nebula theory - describes how stars and planets form from contracting, spinning disks of gas and dust - nebula collapse and contract compressing gases and increasing the temperature -nebula fission begins
What is the Sun composed of? 75% hydrogen 25% helium - small amounts of other gases
Nuclear fission is ... Energy production that is a result of hydrogen atoms combining to form helium -nuclear reaction
When the Sun grows, .... Helium settles in the Sun's core because it is more dense than hydrogen - Region of hydrogen around the core grow larger - the sun is 30% larger today than when it was a protostar, 5 billion years ago
The sun's lifespan is 10 billion years
Features of the Sun -photosphere: the surface layer of the sun, which is 6000 degrees Celsius - sunspots: are of strong magnetic fields on the photosphere, cooler than the photosphere ( 4ooo degrees), occurs in 22 year cycles, peaking in numbers ever 11 years
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