How far is one light year?

One light year is approximately 9.461 trillion kilometers (9.461 x 10^12 km) or 5.879 trillion miles. It is the distance that light travels in one year at a speed of 299,792.458 km per second. For comparison, the Sun is only 8.3 light minutes away from Earth.

What is the nearest star to Earth?

Proxima Centauri is the nearest star to our solar system at 4.24 light years away. That equals about 40.14 trillion km. Even traveling at the speed of light, it would take over 4 years to reach it. The fastest spacecraft ever launched (Parker Solar Probe) would take about 6,300 years.

What is an astronomical unit (AU)?

1 AU is the average distance from Earth to the Sun, approximately 149.6 million km (93 million miles). It is commonly used to measure distances within our solar system. For example, Jupiter is about 5.2 AU from the Sun, and Neptune is about 30 AU.

1 parsec equals approximately 3.262 light years or 30.86 trillion km. The word comes from "parallax arcsecond" and is the preferred unit of distance in professional astronomy. The Milky Way galaxy is about 30,000 parsecs (30 kpc) in diameter.

Is this calculator free?

Yes, completely free with no registration. Convert between 7 distance units used in astronomy instantly.

प्रकाश वर्ष दूरी कैलकुलेटर

प्रकाश वर्ष, किलोमीटर, मील, खगोलीय इकाई (AU), पारसेक, प्रकाश सेकंड और प्रकाश मिनट के बीच रूपांतरण करें।

⚡ तत्काल परिणाम📱 मोबाइल अनुकूल🌍 15 भाषाएं

से

मान दर्ज करें

ब्रह्मांडीय दूरियां

Proxima Centauri (nearest star)4.24 ly

Sirius (brightest star)8.6 ly

Betelgeuse700 ly

Center of Milky Way26,000 ly

Andromeda Galaxy2,537,000 ly

1 प्रकाश वर्ष = 9.461 ट्रिलियन किमी। प्रकाश 299,792 किमी/सेकंड की गति से चलता है।

The light year distance calculator converts between seven astronomical distance units: light years, kilometers, miles, astronomical units (AU), parsecs, light seconds, and light minutes. Enter a value in any unit and see all six other conversions simultaneously — essential for astronomy enthusiasts, students, and science educators.

A light year is the distance light travels in one vacuum year: approximately 9.461 trillion kilometers or 5.879 trillion miles. Light moves at exactly 299,792.458 km per second, making it the universal speed limit. For scale: sunlight takes 8.3 minutes to reach Earth (1 AU), while the nearest star Proxima Centauri is 4.24 light years away — meaning the light you see from it tonight left the star over 4 years ago.

The interactive cosmic distances table lets you click on famous celestial objects — from Proxima Centauri (4.24 ly) to the Andromeda Galaxy (2.5 million ly) — and instantly see the distances in all units. Use this alongside our Unit Converter for terrestrial measurements and Speed Calculator for earthly speed problems.

प्रकाश वर्ष दूरी कैलकुलेटर

❓अक्सर पूछे जाने वाले प्रश्न

अक्सर पूछे जाने वाले प्रश्न