Ritchey–Chrétien telescope

Template:Use mdy dates An "order of magnitude" is a loose description of the relationship between two amounts. In common usage, the scale is usually the base¹⁰ or base^-10 exponent being applied to an amount, making the order of magnitude 10 times greater or smaller. As the differences are measured in factors of 10, a logarithmic scale is applied. In terms of time, the relationship between the smallest limit of time, the Planck time, and the next order of magnitude larger is 10.

Seconds

Orders of magnitude (Time)

Factor (s)	Multiple	Symbol	Definition	Comparative examples & common units	Orders of magnitude
10−44	1 Planck time.	tP	The time required to travel one Planck length at the speed of light (c).	Template:Val = Template:Val: One Planck time tP = $\sqrt{\hslash G/c^5}$ ≈ Template:Val is the briefest physically meaningful span of time. It is the unit of time in the natural units system known as Planck units.	Template:Val, Template:Val ([[1 E-44 s|Template:Val]], [[1 E-43 s|Template:Val]])
10−24	1 yoctosecond	ys	Yoctosecond, (yocto- + second), is one septillionth (short scale) of a second.	0.3 ys: mean life of the W and Z bosons. 0.5 ys: time for top quark decay, according to the Standard Model. 1 ys: time taken for a quark to emit a gluon. 23 ys: half-life of 7H.	1 ys and less, 10 ys, 100 ys
10−21	1 zeptosecond	zs	Zeptosecond, (zepto- + second), is one sextillionth (short scale) of one second.	7 zs: half-life of helium-9's outer neutron in the second nuclear halo. 17 zs: approximate period of electromagnetic radiation at the boundary between gamma rays and X-rays. 300 zs: approximate typical cycle time of X-rays, on the boundary between hard and soft X-rays. 500 zs: current resolution of tools used to measure speed of chemical bonding	1 zs, 10 zs, 100 zs
10−18	1 attosecond	as	One quintillionth of one second	12 attoseconds: shortest measured period of time.	1 as, 10 as, 100 as
10−15	1 femtosecond	fs	One quadrillionth of one second	1 fs: Cycle time for 390 nanometre light; transition from visible light to ultraviolet; light travels 0.3 micrometers (µm)	1 fs, 10 fs, 100 fs
10−12	1 picosecond	ps	One trillionth of one second	1 ps: half-life of a bottom quark; light travels 0.3 millimeters (mm) 4 ps: Time to execute one machine cycle by an IBM Silicon-Germanium transistor	1 ps, 10 ps, 100 ps
10−9	1 nanosecond	ns	One billionth of one second	1 ns: Time to execute one machine cycle by a 1 GHz microprocessor 1 ns: Light travels Template:Convert	1 ns, 10 ns, 100 ns
10−6	1 microsecond	µs	One millionth of one second	1 µs: Time to execute one machine cycle by an Intel 80186 microprocessor 4–16 µs: Time to execute one machine cycle by a 1960s minicomputer	1 µs, 10 µs, 100 µs
10−3	1 millisecond	ms	One thousandth of one second	1 ms: time for a neuron in human brain to fire one impulse and return to rest 4–8 ms: typical seek time for a computer hard disk 100–400 ms (=0.1–0.4 s): Blink of an eye 18–300 ms (=0.02–0.3 s): Human reflex response to visual stimuli	1 ms, 10 ms, 100 ms
100	1 second	s		1 s: 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. 60 s: 1 minute	1 s, 10 s, 100 s
103	1 kilosecond (16.7 minutes)	ks	One thousand seconds.	3.6 ks: 3600 s or 1 hour 86.4 ks: 86 400 s or 1 day 604.8 ks: 1 week	103 s, 104 s, 105 s
106	1 megasecond (11.6 days)	Ms	One million seconds.	2.6 Ms: approximately 1 month 31.6 Ms: approximately 1 year ≈ 107.50 s	106 s, 107 s, 108 s
109	1 gigasecond (32 years)	Gs	One billion seconds.	2.1 Gs: average human life expectancy at birth (2011 estimate) 3.16 Gs: approximately 1 century 31.6 Gs: approximately 1 millennium	109 s, 1010 s, 1011 s
1012	1 terasecond (32 000 years)	Ts	One trillion seconds.	6 Ts: time since the appearance of Homo sapiens (approximately)	1012 s, 1013 s, 1014 s
1015	1 petasecond (32 million years)	Ps	One quadrillion seconds	7.1–7.9 Ps: 1 galactic year (225-250 million years) 143 Ps: the age of the Earth 144 Ps: the approximate age of the Solar system and the Sun. 430 Ps: the approximate age of the Universe 440 Ps: the half-life of thorium 232	1015 s, 1016 s, 1017 s
1018	1 exasecond (32 billion years)	Es	One quintillion seconds.	312 Es: Estimated lifespan of a 0.1 solar mass red dwarf star.	1018 s, 1019 s, 1020 s
1021	1 zettasecond (32 trillion years)	Zs	One sextillion seconds.	3 Zs: Estimated duration of Stelliferous Era. 9.8 Zs: the lifetime of Brahma in Hindu mythology	1021 s, 1022 s, 1023 s
1024	1 yottasecond (32 quadrillion years)	Ys	One septillion seconds.	1.6416 Ys: Estimated half-life of the meta-stable 20983Bi radioactive isotope. 6.616×1050 Ys: Time required for a 1 solar mass black hole to evaporate completely due to Hawking radiation, if nothing more falls in.	1024 s, 1025 s, 1026 s and more

See also

• Orders of magnitude (frequency)

Years

Orders of magnitude (time)

Factor (a)	Multiple	common units	Orders of magnitude
10−50		Planck time, the shortest physically meaningful interval of time ≈ 1.71Template:E a	10−50 a
10−24	1 yoctoannum	--	1 ya and less, 10 ya, 100 ya
10−21	1 zeptoannum	--	1 za, 10 za, 100 za
10−18	1 attoannum	--	1 aa, 10 aa, 100 aa
10−15	1 femtoannum	--	1 fa, 10 fa, 100 fa
10−12	1 picoannum	--	1 pa, 10 pa, 100 pa
10−9	1 nanoannum	1 second = 3.17 × 10−8 a ≈ 10-7.50 a	1 na, 10 na, 100 na
10−6	1 microannum	1 minute = 1.90 × 10−6 a 1 hour = 1.40 × 10−4 a	1 ua, 10 ua, 100 ua
10−3	1 milliannum	1 day = 2.73 × 10−3 a 1 week = 1.91 × 10−2 a	1 ma, 10 ma, 100 ma
100	1 annum	1 average year = 1 annum (= 365.24219 SI days) decade = 10 anna century = 100 anna	1 a, 10 a, 100 a
103	1 kiloannum	millennium = 1000 anna	103 a, 104 a, 105 a
106	1 megaannum	epoch = 1,000,000 anna	106 a, 107 a, 108 a
109	1 gigaannum	aeon = 1,000,000,000 anna 13.8 Ga = 1.38×1010 a ≈ 13.8 billion years, the approximate age of the Universe	109 a, 1010 a, 1011 a
1012	1 teraannum	---	1012 a, 1013 a, 1014 a
1015	1 petaannum	---	1015 a, 1016 a, 1017 a
1018	1 exaannum	19 exaannum: Estimated half-life of the "stable" 20983Bi radioactive isotope.	1018 a, 1019 a, 1020 a
1021	1 zettaannum	--	1021 a, 1022 a, 1023 a
1024	1 yottaannum	--	1024 a, 1025 a, 1026 and more

The pages linked in the right-hand column contain lists of times that are of the same order of magnitude (power of ten). Rows in the table represent increasing powers of a thousand (3 orders of magnitude).

Conversion from year to second is year × 31 557 600 using the Julian year. Conversion from ${\log }_{10}\text{ year}$ to ${\log }_{10}\text{ second}$ is approximately ${\log }_{10}\text{ year}+7.50$. Example conversion; $1\text{ year}=10^0\text{ year}=10^{0+7.50}\text{ seconds }=10^{0.50+7}s=3.16*10^{7}s$.

Footnotes

Notes

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References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

• Exploring Time from Planck time to the lifespan of the universe