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Is there a Planet Nine out there, hiding in the far ends of our Solar System?

Firstpost - Sep 5, 2018
An astronomical unit or AU is the average distance between the Earth and the Sun. One AU is 149,598,000 kilometres and by simple math, this means that 600 AU is 89,75,88,00,000 kilometres away. In short, it is really, really far. NASA had also released ...

See space rock 2018 RC whizz by Earth closer than the Moon this weekend

Astronomy Now Online - Sep 7, 2018
Believed to be up to 70 metres in size – the same as the wingspan of a Boeing 747 Jumbo Jet – Aten-type asteroid 2018 RC has a 289¾-day orbit that brings it to within 0.653 astronomical unit (AU) of the Sun at perihelion, out to 1.061 AU at aphelion.

Solar eruptions may not have slinky-like shapes after all

Science Daily - Aug 30, 2018
Wind had only separated one percent of one astronomical unit (AU), which is the distance from the sun to the Earth (93,000,000 miles). So, instead of now being in front of Earth, with ACE, Wind was now perpendicular to the Sun-Earth line, or on the side.

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Astronomical Unit videos

What is an Astronomical Unit?

Ever wondered just how long one AU is? Well here is the answer in roughly one minute!

Astronomical units

An introduction to the astronomical units: the light-year, the parsec and the astronomical unit. By Cowen Physics (www.cowenphysics.com)

Astronomical units, parsecs and light years, explained: fizzics.org

Astronomical units , the parsec and the light year are different units commonly used to measure distances in astronomy. Where they come from and how they ...

Measuring the Universe

The vast size of the universe requires special units when measuring distances. This video explains the Astronomical Unit, the Light-year and the parsec.

Class 10 1, Chapter 1B, Question 8, Astronomical Unit, Light Year, Par second