Astronomy4

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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


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