Why can't we agree on the Hubble constant?

Welcome to Wednesday public open evenings at Cambridge University Astronomy! Every Wednesday evening during the winter we open our doors to the public, with a popular talk about some fascinating astronomy research followed by (weather-dependent) stargazing.

Our talk this week will be "Why can't we agree on the Hubble constant?", by astronomer Dr Suhail Dhawan

[davidhine]

The purpose of the Astrogeometry equation is to show Hubble's Constant can easily be calculated, knowing just the speed of light (C), Pi, and the stardard Parsec. Nothing else is reqired!!! It also shows that Hubble's Constant is a true "fixed" in value CONSTANT. Any variations away from 71 are due to measuring uncertaincies, interpretation mistakes, and also "local" effects in a particular area of the Universe. 71 K/S/MPS is the TRUE value, as "fixed" by the Astrogeometry equation. SOLVED!!!

[davidanderson]

Here is a question. There are zero asumptions in my question. (It may be a good question, it may be a logical question, but simplistic, with known answers, and I am simply not educated in the field.)
Say we observe light from a galaxy 10 Billion light years away.
Are there not NUMEROUS disparate past factors, no longer active NOW, over the 10 billion light years of travel to us, that could have affected the light spectrem we prerceive now?

If, say 9 billion years ago, something (anything, the expansion rate of space, the various gases of another galaxy that is no longer there, etc) was cause to a shift in the spectrum of light from said galaxy, and that causative factor was no longer active, would the light we perceive now not still carry that PAST spectrum shift message, despite the fact that the cause of said shift is no longer affecting the light?

(Say in the first billion years of said light leaving that galaxy space WAS expanding very fast, and that billion years of red shifted light is only reaching us now, would the light still record that past expansion for the next billion years or so of our experience of it?) Is it possible that we are measuring how fast space was expanding over time?

And, if the expansion of space has steadily slowed over our 13.6 biillion years, would not our observational time lapse observation of said red shift, give the perspective of ever increasing expansion as we look ever deeper into the past?

In other words the steady decay of expansion rate over time, would produce the illusion of ever more rapid expansion, the further distance into the past one observed?

It does not appear that the disparate "ladder" measurements of star and galaxy distance overlap, or confirm distance AND recessional velocity. Telling the standard candle brightness does not give red shift, and red shift can only give expansion rate of said light, over the TIME of its journey. Therefore it appears that a steady drop in expansion rate, would produce the hubble constant, and mimic an ever increasing expansion over distance.

[davidhine]

The Hubble Constant is easily calculated from the following equation:- 2 X a Megaparsec X C, divided by Pi to the power of 21 = 71 K/S/MPS. This is known as "The Principle of Astrogeometry". The Hubble Constant is "fixed" at 71. There is no such thing as "dark energy".

[erhanabdurrahman]

The expansion of Universe is mentioned in Sacred Qur'an about 1400 years ago even Einstein didn't know about it till Georges Lamatrie and Edwin Hubble prooved it about 1927-1929 ;

I seek refuge with Allah (The God) from expelled devil

Sacred Qur'an Chapter 51 - el Zariyat (Spreading Winds)

47. Indeed We constructed the universe with power, and We are expanding it.

48. And the earth—We spread it out—How well We prepared it!

49. We created all things in pairs, so that you may reflect and ponder.

50. “So flee towards Allah (The God). I am to you from Him a clear warner.”

51. “And do not set up any other god with Allah. I am to you from Him a clear warner.”

52. Likewise, no messenger came to those before them, but they said, “A sorcerer or a madman.”

53. Did they recommend it to one another? In fact, they are rebellious people.

54. So turn away from them; you are not to blame.

55. And remind, for the reminder benefits the believers.

56. I did not create the jinn and the humans except to worship Me.

57. I need no livelihood from them, nor do I need them to feed Me.

58. Allah is the Provider, the One with Power, the Strong.

59. Those who do wrong will have their turn, like the turn of their counterparts, so let them not rush Me.

60. So woe to those who disbelieve because of that Day of theirs which they are promised.

[erhanabdurrahman]

Also The Big Bang is mentioned in Sacred Qur'an ;

Chapter 21 - al Anbiya (The Prophets)

30. Do the disbelievers not see that the heavens and the earth were one mass, and We clove them asunder? And We made from water every living thing. Will they not believe?

31. And We placed on earth stabilizers (mountains), lest it sways with them, and We placed therein signposts and passages, that they may be guided.

32. And We made the sky a protected ceiling; yet they turn away from its wonders.

33. It is He who created the night and the day, and the sun and the moon; each floating in an orbit.

34. We did not grant immortality to any human being before you (Muhammed). Should you die, are they then the immortal?

35. Every soul will taste death. We burden you with adversity and prosperity—a test. And to Us you will be returned.

36. When those who disbelieve see you, they treat you only with ridicule: “Is this the one who mentions your gods?” And they reject the mention of the Merciful.

37. The human being was created of haste. I will show you My signs, so do not seek to rush Me.

38. And they say, “When will this promise come true, if you are truthful?”

39. If those who disbelieve only knew, when they cannot keep the fire off their faces and off their backs, and they will not be helped.

40. In fact, it will come upon them suddenly, and bewilder them. They will not be able to repel it, and they will not be reprieved.

41. Messengers before you were also ridiculed, but those who jeered were surrounded by what they had ridiculed.

42. Say, “Who guards you against the Merciful by night and by day?” But they turn away from the mention of their Lord.

43. Or do they have gods who can defend them against Us? They cannot help themselves, nor will they be protected from Us.

44. We have given these enjoyments, and their ancestors, until time grew long upon them. Do they not see how We gradually reduce the land from its extremities? Are they then the victors?

45. Say, “I am warning you through inspiration.” But the deaf cannot hear the call when they are being warned.

46. And when a breath of your Lord’s punishment touches them, they say, “Woe to us, we were truly wicked.”

47. We will set up the scales of justice for the Day of Resurrection, so that no soul will suffer the least injustice. And even if it be the weight of a mustard-seed, We will bring it up. Sufficient are We as Reckoners.

48. We gave Moses and Aaron the Criterion, and illumination, and a reminder for the righteous.

49. Those who fear their Lord in private, and are apprehensive of the Hour.

50. This too is a blessed message that We revealed. Are you going to deny it?

51. We gave Abraham his integrity formerly, and We knew him well.

52. When he said to his father and his people, “What are these statues to which you are devoted?”

53. They said, “We found our parents worshiping them.”

54. He said, “You and your parents are in evident error.”

55. They said, “Are you telling us the truth, or are you just playing?”

56. He said, “Your Lord is the Lord of the heavens and the earth, the One who created them, and I bear witness to that.

57. “By Allah, I will have a plan for your statues after you have gone away.”

58. So he reduced them into pieces, except for their biggest, that they may return to it.

59. They said, “Who did this to our gods? He is certainly one of the wrongdoers.”

60. They said, “We heard a youth mentioning them. He is called Abraham.”

61. They said, “Bring him before the eyes of the people, so that they may witness.”

62. They said, “Are you the one who did this to our gods, O Abraham?”

63. He said, “But it was this biggest of them that did it. Ask them, if they can speak.”

64. Then they turned to one another, and said, “You yourselves are the wrongdoers.”

65. But they reverted to their old ideas: “You certainly know that these do not speak.”

66. He said, “Do you worship, instead of Allah, what can neither benefit you in anything, nor harm you?

67. Fie on you, and on what you worship instead of Allah. Do you not understand?”

68. They said, “Burn him and support your gods, if you are going to act.”

69. We said, “O fire, be coolness and safety upon Abraham.”

70. They planned to harm him, but We made them the worst losers.

71. And We delivered him, and Lot, to the land that We blessed for all people.

72. And We granted him Isaac and Jacob as a gift; and each We made righteous.

73. And We made them leaders, guiding by Our command; and We inspired them to do good works, and to observe the prayer, and to give out charity. They were devoted servants to Us.

74. And Lot—We gave him judgment and knowledge, and We delivered him from the town that practiced the abominations. They were wicked and perverted people.

75. And We admitted him into Our mercy; for He was one of the righteous.

76. And Noah, when he called before. So We answered him, and delivered him and his family from the great disaster.

77. And We supported him against the people who rejected Our signs. They were an evil people, so We drowned them all.