Astronomy4
Large diameter advantage (telescope)
better resolution
Sun's Diameter
1.4 million km
The calculation using the Hubble constant to calculate the age of the Universe
1/h
A change in 5 magnitudes corresponds to a change in brightness by this many times
100
The length of a Sunspot cycle
11 years
The number of Messier objects
110
Earth's Diameter
13,000km
Sun's core temperature
15 million k
Distance of one Astronomical Unit (AU)
150 million km
Sun's distance from Earth
150 million km
The temperature variation in a Cepheid Star
1500K
Temperature of Sun's Corona
2 million k
A change of 1 magnitude increases the factor of brightness by this many times
2.5
The distance of the Andromeda Galaxy away from Earth
2.9 light years
The approximate number of Stars that make up the Milky Way
200 billion
Earth's Rotation Period
23 hrs 56 mins
Sun's rotation period at equator
25 days
Moon's Rotational Period and orbit
27.3 days
Length of Lunar phase cycle
29.5 days
Galaxies within this ramge are in the 'local group'
3 light years
The number of years after the Big Bang at which CMB radiation became present
300,000
Distance of both Van Allen Belts
3000km, 16000km
Moon's Diameter
3500km
Sun's rotation period at poles
36 days
1 degree = how many arcsec?
3600
Moon's distance from Earth
380,000km
Time difference between Solar and Sidereal Day
4 minutes
Time for the Earth to roatate through 1 degree
4 minutes
The absolute magnitude of the Sun
4.8
Earth's Circumference
40,075km
Temperature of Sun's Photosphere
5,800k
The first exoplanet to be discovered
51 Pegasi
Distance needed in km for a Comet to become a PHO
7.5 million km
How many times greater the mass of Earth is compared to the mass of the Moon
81
The amount of constellations in the sky
88
How bright a star is from a distance of 10 parsecs
Absolute magnitude
A dark area of gas cloud
Absorption Nebula
The flattened disc of matter that gets caught in a spinning black hole
Accretion disc
When a planet's orbit is furthest away from the Sun
Aphelion
The position of the Moon when Annular eclipses are possible
Apogee
The brightness of a star observed from Earth
Apparent Magnitude
The name for a shape seen in a constellation
Asterism
The line due South from the observer
Meridian
Asteroid collision evidence
Moon crusters Earth crusters Uranus/ Venus spin
Earth's Shape
Oblate Spheroid
When a small celestial object passes behind a larger one one
Oculation
Place where long period comets originate from
Oort Cloud
When an outer planet moves directly behind eath on a line 0 degrees with the Sun
Opposition
In Kelper's third law t^2=r^3 what do t and r represent?
Orbit and mean distance from Sun
The distance at which a star has a parralax angle of 1 arcsec
Parsec (3.26 ligt years)
The position of the Moon when total eclpises are possible
Perigee
When a planet's orbit is closest to the Sun
Perihelion
How to observe safely?
Projection telescope projection into a monitor
Radio telescope discoveries
Pulsars Qusars CMBR
Distant galaxies with high redshift
Quasars
A gas cloud that shines due to reflected starlight
Reflection Nebula
The time given to stars observed as the Earth rotates
Right Ascension
Time of exposure x 360 / angle measures = ?
Rotation period of earth
Comets that have a period of less than 200 years
Short Period
When the Earth makes one revolution bringing us back to the same position with the background stars.
Sidereal Day
When Moon moves in front of the Sun
Solar Eclipse
Hubble's conatsnt x distance = ?
Speed of recession
Atmosphere Level? Radio Waves absorbed and reflected UV and X rays absorbed Meteros burn up
Stratosphere
1. The highest point; the peak. 2. The point in the sky directly above the observer.
Zenith
The declination of Polaris in degrees
+90
What colour are the hottest stars in the sky
Blue
Stars that expand and contract by up tp 30% in size over a short time
Cepheid
Three dwarf planets
Ceres, Pluto, Eris
Name given to stars that never sink below the horizon
Circumpolar
Two bodies rotate grivitationally around this
Common centre of mass
When two objects viewed from earth are on a line 0 degrees with the Sun
Conjunction
Planetery nebula
Death
The angular distance north or south of the celestial equator
Declination
Shorter, wider and more curved tail of a comet
Dust tail
The plane of the Earth's orbit around the Sun
Ecliptic
Shape of planet orbits
Elliptic
A gas cloud that emits light
Emission Nebula
The moon of Jupiter with a sea under an icy crust
Europa
Atmosphere Level? Contains Van Allen Belts which have affect on solar radiation
Exosphere
Directly proportional to the product of their masses describes this force
Gravity
Force=1/distance^2 gives the value of this force
Gravity
The most favourable position for inferior planets to be viewed
Greatest Elongation
In which band are globular clusters found?
Halo
This sustem puts stars into one of 7 spectral types
Harvard system
The outer ring of the plane of the Earth's surface, at 90° to the zenith line
Horizon
Main part of comet tail that points directly away from the Sun
Ion tail
Atmosphere Level? Ozone layer absorbs UV
Ionosphere
Place where short period comets originate from
Kuiper Belt
Distance in degrees north or south of the equator
Latitude
1 / distance^2 = ?
Light intensity
Distance east or west of the prime meridian, measured in degrees
Longitude
The Moon moves into the shadow of the Earth
Lunar Eclipse
Give the equation that relates absolute magnitude (M) and apparent magnitude (m)
M=m+5-5logd
Why dark side of Moon cannot be seen
Synchronous Rotation
When a small celestial planet moves in front of a larger one
Transit
Atmosphere Level? Contains 75% of Atmosphere Contains weather Contains life supporting gases
Troposphere
Four layers of the Earth's atmosphere
Troposphere, Stratosphere, Ionosphere, Exosphere
The man who discovered Uranus
William Herschel
The EM waves emitted by black holes
X-rays
Kuiper Belt
where short peioud comets originate from beyond neptune ICe/ Rock bodies