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Some 70000 years ago, a rogue star duo whooshed by our solar system — and early humans probably saw it

ZME Science - Mar 22, 2018
Scholtz's star passed approximately 52,000 astronomical units away from the Sun (1 astronomical unit is equivalent to the distance between the Earth and the Sun) — the equivalent of 0.82 lightyears. It's estimated that a star passes through the Oort ...

Rings and gaps in a developing planetary system

Phys.Org - Apr 2, 2018
CfA astronomers Sean Andrews and David Wilner were members of a team of scientists who used the ALMA facility to image the dust around the young star Elias 24 with a resolution of about 28 au (one astronomical unit being about the average distance of ...

Why is asteroid Bennu 'potentially hazardous'? Need for NASA HAMMER explained

International Business Times, India Edition - Mar 21, 2018
Of these, "asteroids with a minimum orbit intersection distance (MOID) of 0.05 au (astronomical unit, which is roughly 7.480 million km or 4.65 million miles) or less and an absolute magnitude (H) of 22.0 or less" are called Potentially Hazardous ...

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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!

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.

What is An Astronomical Unit? | Astronomy words and definitions by Astronomy Facts

What is An Astronomical Unit? A unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun. Please follow us on Facebook:...

Astronomical unit Meaning

Video shows what astronomical unit means. The mean distance from the Earth to the Sun (the semi-major axis of Earth's orbit), approximately 149600000 kilometres (symbol AU), used to measure...

Distances in Space

Scales in the Universe with definitions of the important measurements - The Astronomical Unit; the Light Year and the Parsec.