Celestial bodies
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Celestial Bodies. ERAU RET Erica Ajder. Andromeda galaxy. Crab Nebula. Sombrero Galaxy. Horsehead nebula. Ultra Deep Field. Article Feedback. Based on the article write 3 interesting facts or comments that you found from the article Share 1 interesting fact or comment with the group.

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Celestial Bodies

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Celestial bodies

Celestial Bodies


Erica Ajder

Andromeda galaxy

Andromeda galaxy

Crab nebula

Crab Nebula

Sombrero galaxy

Sombrero Galaxy

Horsehead nebula

Horsehead nebula

Ultra deep field

Ultra Deep Field

Article feedback

Article Feedback

  • Based on the article write 3 interesting facts or comments that you found from the article

  • Share 1 interesting fact or comment with the group

Hubble Telescope

Black body radiation

Black Body Radiation

  • What you think a blackbody is?

  • A blackbody is a surface that absorbs all electromagnetic radiation

  • All bodies with temperature give off thermal radiation

  • As temperature increases, blackbodies emit visible light from longer wavelength or lower frequency (red) to shorter wavelength or higher frequency (blue)

Star color composition

Star Color/composition

  • What is a star made of?

  • It is made up of various gaseous elements

  • The center of a star is dense; the outer layers are less dense and make up the star’s atmosphere

  • What does the spectrum of a star tell you about the star?

  • The spectrum of a star gives information about the composition and temperature of a star

Emission spectrum

Emission Spectrum

  • What do you think Emission Spectrum means?

  • Emission lines are lines made when certain wavelengths, of light, or colors, are given off by hot gasses.

  • Each elements produces a unique set of emission lines, which assists in identifying the elements in a star.

  • This set of lines is known as the emission spectrum

Absorption spectrum

Absorption spectrum

  • What do you think absorption spectrum is?

  • A star’s spectrum is made of dark emission lines. A star’s atmosphere absorbs certain colors of light, which causes black lines to appear.

  • Because a star’s atmosphere absorbs some colors of light, the spectrum of a star is called an absorption spectrum.

Example of each spectrum type

Example of Each Spectrum Type

What do you notice about the absorption & emission spectrum of hydrogen?

Emission spectrum of common star elements

Emission Spectrum of Common Star Elements

Kirchoff s laws

Kirchoff’s Laws

1. A hot solid object produces light with a continuous spectrum

2. A hot gas at low pressure produces an emission spectrum

3. Light passing through a cool gas will produce an absorption spectrum

Examples of laws

Examples of Laws

3. Light passing through a cooler gas

2. Hot gas at low temperature

1. Light passing through Solid Object

Write down which elements are observed in this star

Write down which elements are observed in this star


Write down which elements are observed in this star1

Write down which elements are observed in this star


Hertzsprung russell diagram h r diagram

Hertzsprung-Russell Diagram H-R Diagram



  • the apparent shift in the position of an object when viewed from different locations

Courtesy of Holt Reinhart

Apparent absolute magnitude

Apparent & Absolute magnitude

  • What do you think is the difference between Apparent & Absolute Magnitude?

  • Apparent Magnitude - the brightness of a star as seen from Earth

  • (how bright it looks to you)

  • Absolute Magnitude is the actual measured brightness of a star

  • The absolute magnitude of our sun is 4.8 but because it is so close it appears to be a -26.8 (extremely bright)

Types of stars

Types of Stars

  • What stage of a star’s life cycle lasts the longest?

  • Main sequence -2nd & longest stage

  • What stages could a star enter after main sequence?

  • Red Giant or Red Supergiant

  • Red Giants can be 10x larger than our sun

  • Supergiants can be 100x larger than our sun

Types of stars continued

Types of stars Continued

  • What stage could a star the size of our sun or smaller enter after being a Red Giant?

  • White Dwarf – a small hot dim star that is leftover center of an old star

  • White Dwarfs run out of hydrogen and no longer fuse hydrogen to make helium

When stars get old

When stars get old

  • What happens when a massive star collapses and throws its outer layers into space?

  • Supernova - can be brighter than an entire galaxy for several days

  • Particles at the core collapse to form neutrons

  • If the mass of this new star is about 2 times the mass of the sun, a neutron star may form

  • A pulsar is a spinning neutron star

Name the type of star in each picture below

Name the type of star in each picture below







Sun sizes compared

Sun Sizes compared

3 types of galaxies

3 Types of Galaxies

  • What are the 3 types of galaxies?

  • Spiral, Elliptical, Irregular

  • Identify the 3 types below




Irregular- galaxies that do not fit into any other category

Elliptical- 1/3 of all galaxies are massive blobs of stars & contain mostly older stars

Spiral- galaxies that have a bulge in center & arms that spiral outward

Which of the following forces holds galaxies together

Which of the following forces holds galaxies together?

  • A. Electrical

  • B. Electromagnetic

  • C. Gravitational

  • D. Magnetic

Celestial bodies

Which one of the following properties do astronomers use to determine temperature & Composition of stars?

  • A.the apparent motion of stars

  • B.the absolute magnitude of stars

  • C.the apparent magnitude of stars

  • D.the absorption spectrum of stars

What type of star

What type of star?

Astronomers estimate that in another 5 billion years, the Sun will burn up all of its hydrogen fuel. At the end of this 5-billion year pd., what kind of star will the Sun change into?

  • A.red giantC. white dwarf

  • B.red dwarfD. red supergiant

    Which of the following colors would indicate to an astronomer that a star has a very high surface temperature?

  • F.blue

  • G.orange

  • H.red

  • I.yellow

Properties of waves

Properties of waves

  • What does a wave carry?

  • Energy

  • What are the 4 properties of a wave?

  • Frequency – # of waves per sec (Hertz)

  • Wavelength – distance between any pt on a wave to identical pt on next wave

  • Amplitude – distance particles vibrate from rest position

  • Wavespeed –

    speed a wave



Types of waves

Types of waves

  • What are the 2 main types (not examples) of waves?

  • Transverse - waves in which the particles vibrate perpendicularly to the direction wave is traveling; has crest & troughs; medium not required – examples?

  • Electromagnetic waves, rope waves

  • Longitudinal - waves in which the particles vibrate back & forth along the path that waves move; has compressions and rarefactions; must have a medium – examples?

  • Sound waves, seismic waves, spring waves

Electromagnetic em waves

Electromagnetic (EM) Waves

  • Name as many types of EM waves that you can in 2 min with your groups

  • Visible Light

  • Radio waves

  • Microwaves

  • X-rays

  • Gamma

  • Infrared

  • Ultraviolet

  • All waves produced by stars & galaxies

Electromagnetic spectrum

Electromagnetic spectrum

Place the previously discussed electromagnetic waves on the spectrum chart

Use chart to give examples of each type of wave

Use chart to give examples of each type of wave

Insect use to see flowers

Dangers of waves

Dangers of waves

  • Which waves are considered dangerous if exposed to large amounts?

  • X-rays, Gamma & Ultraviolet

  • Why?

  • The higher the frequency and the shorter wavelength the more dangerous the wave because they have more ENERGY and can travel directly through matter

  • Which of the 3 do we have most contact with on a regular basis?

  • Ultraviolet



  • How can we protect ourselves from dangerous waves?

  • Sunblock

  • Protective clothing

  • UV blocking sunglasses

  • Stay out of the sun

  • Lead aprons when receiving x-rays

Planet introduction

Planet introduction

  • All planets are bound to stars because of _?_

  • Refresher:

  • All planets move in an __________around a star

  • Planets move fastest when ____________ (closer/further) to its star

  • The further a planet is from the sun the _________ it takes to orbit the sun

  • The further a planet is from the sun the _________ the gravitational pull





Solar system sizing

Solar system sizing

Hodometer lab

Hodometer Lab

  • Follow directions in order to create a scaled down version of the planets in order to envision planet spacing in our solar system

Celestial body project

Celestial body project

  • Each one of you is going to do a project on one celestial body

  • You will be teaching your celestial body to the class through a power point presentation next week

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