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SOLVED: Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. Suppose an asteroid with a diameter of 2.0 km and a mass of 1.0 x 10^13 kg hits the earth with an impact speed of 4.0 x 10^4 m/s.a. What is the earth's recoil speed after such a collision? (Use a reference frame in which the earth was initially at rest.)b. What percentage is this

SOLVED: Most geologists believe that the dinosaurs became extinc…

2023年1月18日

A comet predicted to light up the sky in 2024 may already be doomed

A comet predicted to light up the sky in 2024 may already be doomed

SPACE.comJoe Rao

What are comets? The secret lives of space snowballs, explained.

What are comets? The secret lives of space snowballs, explained.

11 个月之前

MashableElisha Sauers

Super Comet

Super Comet

已浏览 16 次2016年3月1日

topdocumentaryfilms.com

Amazing TimeLapse Of Comet C/2022 E3 ZTF Project

Amazing TimeLapse Of Comet C/2022 E3 ZTF Project

2023年9月17日

Microsoft NewsSpace

Comet last seen in the Stone Age makes appearance over Earth

Comet last seen in the Stone Age makes appearance over Earth

Digital TrendsGeorgina Torbet

Comet Nishimura's Tail Flails In The Solar Wind In Amazing Spacecraft Time-Lapse

Comet Nishimura's Tail Flails In The Solar Wind In Amazing Spacecraf…

2023年10月20日

Microsoft NewsSpace

Meet the Interstellar Comet Helping Map the Solar System’s Evolution

已浏览 2.1万次2021年7月9日

FacebookSeeker by The Verge

NASA Finds Largest Comet Ever

2022年4月13日

Rare Comet Neowise soars across Earth

2020年7月14日

CBS NewsSophie Lewis

It's your best chance to spot a once-in-a-lifetime green comet - here's …

2023年2月1日

Sky NewsTom Acres,technology reporter

Scientists Estimate When Humans Could Become Extinct

2023年9月25日

Microsoft NewsNewsweek

'Once-in-a-lifetime' devil comet expected to zoom by Earth in April

2023年10月31日

USATODAYEric Lagatta

Giant comet to pass Mars for the first time in a million years

2014年10月17日

Green Comet is Passing Earth for the 1st Time in 50,000 Years

2023年2月1日

Scientists Believe a Comet that Struck Earth 13,000 Years Ago Ma…

2023年10月9日

Microsoft NewsDailymotion

Nasa says rare green comet will make first appearance in 50,000 y…

2023年1月20日

The IndependentAndrew Griffin

Recently Discovered Comet Is Currently Going by Earth for Its O…

2023年9月8日

Microsoft NewsBuzz60

NASA Spots Biggest Comet Ever, 500 Trillion Ton Ice Ball Headed T…

2022年4月12日

Comet To Approach Earth for First Time Since Neanderthals Lived

2022年12月23日

Comet To Approach Earth for First Time Since Neanderthals Lived

2022年12月23日

Halley's Comet Is About to Return From the Outer Solar System

11 个月之前

How to see once-in-80,000-year comet in Tennessee night sky

62-mile wide comet comes from the Oort Cloud! See its orbit

已浏览 1.7万次2021年6月26日

FacebookSpace.com

Comet To Approach Earth for First Time Since Neanderthals Lived

2022年12月23日

New Study Deciphers Origin of Comet That Triggered Dinosaur E…

2021年2月24日

The Weather Channel

When and where to view the comet in Colorado

The brightest comet in decades is coming to night skies near you

2020年7月14日

USATODAYRyan W. Miller

Rosetta comet landing: What data can we expect?

2014年11月13日

What is Halley's Comet?

2009年1月1日

universetoday.com

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