Rod Standard

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why are standard candles important to astronomers trying to measure the Hubble constant?

During the 1920's, Edwin Hubble used observations from the Mount Wilson Observatory to show (apparently) that the Universe is expanding. He compared recession velocities of galaxies measured from their spectra to their apparent brightness estimated from existing photographic plates. I'm sure that the actual paper is out on the Internet somewhere, if you want to see the math.

The Universe expansion causes objects at greater and greater distances to be receding from us at higher and higher speeds, at a velocity given by an expression now known as Hubble's Law, an equation that uses the Hubble Constant as a constant. You can probably find the equation on the Internet, too. The value of the Hubble Constant is important for both observations of the objects in the Universe, as it allows us to convert their recession velocities into true distances, and thus for estimating the age of the Universe.

Trouble is, nobody has yet figured out what the actual constant of Hubble's Constant is.

Most techniques for estimating the Hubble Constant rely on using either standard candles or standard rods.

Standard Candles - these objects or events are thought to have fixed luminosities. When observed across a range of distances their apparent luminosities can therefore be used to estimate their relative distances. This class includes: variable stars such as Cepheids, Type 1a Supernova and Luminous Radio Galaxies.

Standard Rods - these are objects with a fixed physical length, using simple geometry the apparent angular size of this feature can be used to estimate the true distance of the source. Unfortunately, this comes with the obvious problem of assuming that you actually have something constant to use as your standard rod.

But that's why standard candles are important. If you know how bright something is, you are theoretically able to determine its distance. Presumably, close is brighter, distant is dimmer.

Find Rod Standard On eBay Below:

ATTWOOD MARINE 66364W7 ATTWOOD STANDARD SERIES ROD HOLDER 0 DEGREE WHITE INSERT
ATTWOOD MARINE 66364W7 ATTWOOD STANDARD SERIES ROD HOLDER 0 DEGREE WHITE INSERT
$41.47
ATTWOOD MARINE 66363W7 ATTWOOD STANDARD SERIES ROD HOLDER 15 DEGREE WHITE INSERT
ATTWOOD MARINE 66363W7 ATTWOOD STANDARD SERIES ROD HOLDER 15 DEGREE WHITE INSERT
$41.11
Davis Big Game Saltwater Fishing Rod Standard Line Guides 30 50 lb set 2
Davis Big Game Saltwater Fishing Rod Standard Line Guides 30 50 lb set 2
$124.95
Davis Big Game Saltwater Fishing Rod Standard Line Guides 50 80 lb set 2
Davis Big Game Saltwater Fishing Rod Standard Line Guides 50 80 lb set 2
$134.95
Davis Big Game Saltwater Fishing Rod Standard Line Guides 30 50 lb
Davis Big Game Saltwater Fishing Rod Standard Line Guides 30 50 lb
$64.95
ATTWOOD MARINE 66363 7 ATTWOOD STANDARD SERIES ROD HOLDER 15 DEGREE BLACK INSERT
ATTWOOD MARINE 66363 7 ATTWOOD STANDARD SERIES ROD HOLDER 15 DEGREE BLACK INSERT
$40.12
DAIWA SHORE SPARTAN STANDARD 96 H Spinning Rod New
DAIWA SHORE SPARTAN STANDARD 96 H Spinning Rod New
$315.89
Davis Big Game Saltwater Fishing Rod Standard Line Guides 50 80 lb
Davis Big Game Saltwater Fishing Rod Standard Line Guides 50 80 lb
$69.95
Davis Big Game Saltwater Fishing Rod Standard Guides 80 100 lb Set of 4
Davis Big Game Saltwater Fishing Rod Standard Guides 80 100 lb Set of 4
$292.95
ATTWOOD MARINE 66362 7 ATTWOOD STANDARD SERIES ROD HOLDER 30 DEGREE BLACK INSERT
ATTWOOD MARINE 66362 7 ATTWOOD STANDARD SERIES ROD HOLDER 30 DEGREE BLACK INSERT
$40.12
Davis Big Game Saltwater Fishing Rod Standard Guides 80 100 lb Set 2
Davis Big Game Saltwater Fishing Rod Standard Guides 80 100 lb Set 2
$142.95
Waterworks Lamson 5 Wt Standard Seat Freshwater Fly Rod 9 4pc
Waterworks Lamson 5 Wt Standard Seat Freshwater Fly Rod 9 4pc
$250.00
DAIWA SHORE SPARTAN STANDARD 106 H Spinning Rod New
DAIWA SHORE SPARTAN STANDARD 106 H Spinning Rod New
$356.39
Daiwa BLAST Bay Jigging BJ STANDARD 66HB Baitcasting Rod New
Daiwa BLAST Bay Jigging BJ STANDARD 66HB Baitcasting Rod New
$221.39
Daiwa BLAST Bay Jigging BJ STANDARD 66XXHB Baitcasting Rod New
Daiwa BLAST Bay Jigging BJ STANDARD 66XXHB Baitcasting Rod New
$243.89
Davis Big Game Saltwater Fishing Rod Standard Line Guides 80 100 lb
Davis Big Game Saltwater Fishing Rod Standard Line Guides 80 100 lb
$74.95
New Star Rods Stellar Lite SG Saltwater Spinning Fishing Rod Lifetime Warranty
New Star Rods Stellar Lite SG Saltwater Spinning Fishing Rod Lifetime Warranty
$99.95
Waterworks Lamson Standard Seat Fly Rod 8 weight 9ft 4 pc NEW FREE SHIPPING
Waterworks Lamson Standard Seat Fly Rod 8 weight 9ft 4 pc NEW FREE SHIPPING
$449.99
Daiwa BLAST Bay Jigging BJ STANDARD 66XXHB Baitcasting Rod Fishing Japan New
Daiwa BLAST Bay Jigging BJ STANDARD 66XXHB Baitcasting Rod Fishing Japan New
$443.00
Standard Fishing Reel Seat Bait Casting Reel Seat for Rod Building 115cm
Standard Fishing Reel Seat Bait Casting Reel Seat for Rod Building 115cm
$3.31
Daiwa BLAST Bay Jigging BJ STANDARD 66HB Baitcasting Rod Fishing Japan New
Daiwa BLAST Bay Jigging BJ STANDARD 66HB Baitcasting Rod Fishing Japan New
$435.00
Standard Foot Double Roller Fishing Rod Tip Top Guide 4mm 5mm 6mm 7mm 8mm
Standard Foot Double Roller Fishing Rod Tip Top Guide 4mm 5mm 6mm 7mm 8mm
$4.13
DAIWA SHORE SPARTAN STANDARD 106H Spinning Rod Fishing Japan New
DAIWA SHORE SPARTAN STANDARD 106H Spinning Rod Fishing Japan New
$561.00
Daiwa SHORE SPARTAN STANDARD 96MH Medium Heavy 96 fishing spinning rod JAPAN
Daiwa SHORE SPARTAN STANDARD 96MH Medium Heavy 96 fishing spinning rod JAPAN
$318.16
Daiwa SHORE SPARTAN STANDARD 106MH Medium Heavy 106 fishing spinning rod JAPAN
Daiwa SHORE SPARTAN STANDARD 106MH Medium Heavy 106 fishing spinning rod JAPAN
$342.86
2146 Frabill Jiggler Long Rod 48 Inch with standard reel Black
2146 Frabill Jiggler Long Rod 48 Inch with standard reel Black
$24.74
Daiwa Rod Jig Caster MX 106MH Standard full length 3200mm Joint number 2 NEW
Daiwa Rod Jig Caster MX 106MH Standard full length 3200mm Joint number 2 NEW
$244.90
Daiwa SHORE SPARTAN STANDARD 106M Medium 106 fishing spinning rod from JAPAN
Daiwa SHORE SPARTAN STANDARD 106M Medium 106 fishing spinning rod from JAPAN
$332.40
Waterworks Lamson Standard Seat Fly Rod 11 weight 9ft 4 pc NEW FREE SHIPPING
Waterworks Lamson Standard Seat Fly Rod 11 weight 9ft 4 pc NEW FREE SHIPPING
$449.99
Daiwa SHORE SPARTAN STANDARD 96M Medium 96 fishing spinning rod from JAPAN
Daiwa SHORE SPARTAN STANDARD 96M Medium 96 fishing spinning rod from JAPAN
$306.90
Daiwa Shore Spartan Standard 96M spinning rod F S from Japan
Daiwa Shore Spartan Standard 96M spinning rod F S from Japan
$550.00
Daiwa Shore Spartan Standard 100MH spinning rod F S from Japan
Daiwa Shore Spartan Standard 100MH spinning rod F S from Japan
$565.00


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