Thoughts on where we point telescopes such as the Hubble

[rodsky]

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naa lang ko pangutana rods ha.

kanang light years ba. gi-unsa man na nila pagsukod?
bana-bana lang tingali na.

kay kung ingon ana, possible nga kana atong nakita nga mga bituon ron, patay na diay na. kay nagtravel pa man ang light ug pila ka light years.

QUESTION #1: It can be measured, using the following methods: Speed of light - Wikipedia, the free encyclopedia

QUESTION #2: Yes, exactly. Some of the stars you see in the sky are not there anymore. Whenever you look at the night sky, you are looking at the universe as it was in the past, not in the present time.

You know, for someone who started a thread entitled "Mathematics" in the iStorya.net forum (esp. someone who claims he likes numbers) you sure have a lot of doubt about computation and numbers, based on your very first sentence.

-RODION

[analog man]

pasensya lang gamay jud rods.

nalibog man gud ko ani. gi-unsa jud nila pagkuha ug "time"?

naa sila signal nga gilabay?
they waited for it to came back then named it as time?

or bana2X lang jud ni?

ang pangutana ani sir rods, kung gi-unsa jud nila pagkuha ang distance from here to there.

pwede pud tingali triangulation, pero needed ang distance sa usa ka side.

[rodsky]

ang pangutana ani sir rods, kung gi-unsa jud nila pagkuha ang distance from here to there.

First read this:

The Parallax Method

Then apply the known distances derived from the parallax method, to timed measurements in changes in stellar luminosity (i.e. variable stars etc), and voila, you get a good value for distances across vast reaches of interstellar space.

Yet another good read, designed ni siya so mas dali sabtan sa katong mga dili kasabot:

How do astronomers measure the distance to stars? Is it accurate?

-RODION

[doomsweek]

kung gi-unsa jud nila pagkuha ang distance from here to there

basin maka help ni bro: The Space Place :: How do scientists know the distance between the planets?

EDIT: ni reply na diay si rodsky.

[analog man]

salamat sa link rods. estimate ra jud diay.



nalibog na jud nuon ko ani nga piktyur.

point A and B distance, kaning sa earth sa ha, makaya pa nako ug sabot.

pero kaning point A and B sa taas, labi naning point of intersection, tun-an ko na lang ni. maayo ni da.

[rodsky]

Basically, Analog Man, your confusion arises from the fact nga abi man gud nimo, naa na daan ang light year nga measuring stick, para ma measure ang distances between celestial bodies, which is incorrect--nauna ang parallax method, and then katong nahibaw-an na ang distances, diha palang gigamit ang light years as a unit of measurement, kay dako naman gud kaayo ang figures kung kilometers or miles ang gamiton man gud. Substitute ra man ang light-years as a form of measurement--it is not, in itself, the reason for measuring distances using THAT scale.

So imagine, the distance from the earth to the center of the Milky Way galaxy is, in kilometers:

9,460,730,472,580 (1 light year) x 26,000 light years = 245,978,992,287,080,000 kilometers to the center of the milky way, too cumbersome a number to use, that's why it's easier to say 26,000 light years.

-RODION

[analog man]

OK ra rods oi, na challenge lang ko ani.

Kanang mga pics sa ta-as ba, kuha jud na sa hubble?
kay kung kuha na sa hubble, pwede jud tali na gamiton aron pag-close up sa terrain sa nearby planets nato.

wild suggestion lang.

[analog man]

Basically, Analog Man, your confusion arises from the fact nga abi man gud nimo, naa na daan ang light year nga measuring stick, para ma measure ang distances between celestial bodies, which is incorrect--nauna ang parallax method, and then katong nahibaw-an na ang distances, diha palang gigamit ang light years as a unit of measurement, kay dako naman gud kaayo ang figures kung kilometers or miles ang gamiton man gud. Substitute ra man ang light-years as a form of measurement--it is not, in itself, the reason for measuring distances using THAT scale.

mokatawa sa ko kad**** ha, pasensya na lang jud rods.
wala ko mag-assume ana rods.

my confusion arises sa technology nga gigamit.
sakto ko nga maglabay sila ug signal, likely equal to "c" speed of light sa space. ug ila gikuha ang time sa pagreturn ani gikan pud sa usa ka station sa gawas sa earth.

salamat pud doomsweek. payter to imo link

[rodsky]

OK ra rods oi, na challenge lang ko ani.

Kanang mga pics sa ta-as ba, kuha jud na sa hubble?
kay kung kuha na sa hubble, pwede jud tali na gamiton aron pag-close up sa terrain sa nearby planets nato.

wild suggestion lang.

I don't know if tanan ba nang gipanpost diha kuha ba na sa Hubble--some might be an X-ray (not visible spectrum light) photographs, from Chandra-1 (The Chandra X-ray Observatory Center :: Gateway to the Universe of X-ray Astronomy!) or some other space telescope (Spitzer Space Telescope - Wikipedia, the free encyclopedia) that doesn't pick up visible spectrum light.

Nearby planets (and the moon) are too bright for Hubble's optics--in fact, it is programmed not to look at Venus and Mercury, because both planets are sun-oriented with respect to earth, and the Hubble cannot be pointed towards the sun. But it has been indeed used on Jupiter, esp. during the Shoemaker-Levy 9 cometary impact in 1994.

-RODION

[yesh1314]

hmmm asa man jud diat ipoint ang telescope ...adto jud cguro sah space...stars planets ug unsa pa dha heheh