...NASA alert as TWO asteroids to make ‘close approach’ to Earth on Sunday...

At around 12.14 in the afternoon, it will come as close as 15 lunar distances, which is 15-times the distance from the Earth to the Moon (or about 3.7 million miles).

TWO asteroids are set to drift uncomfortably close to the Earth on Sunday, with the pair of objects passing the planet within five hours of each other.

The largest of the asteroids is estimated to have a diameter as long as 120 metres, making it bigger than most football pitches.

What's exciting this time around, however, is that the largest (sexily named "2009 WB105") has an estimated diameter of between 53 and 120 metres, so even at its smallest possible size it will still be bigger than an Olympic swimming pool.

It will also be faster than the three asteroids from a fortnight ago, travelling at 18.88 kilometres per second, or 64,800 kilometres per hour (about 40,000 miles per hour).

NASA's Close Approach Data makes clear, we'll witness a total of 19 near-Earth objects before January 9th alone, meaning that it could be only a matter of time before our planet collides with another celestial body.

Uh, The Chelyabinsk meteor was a superbolide caused by an approximately 20 m (66 ft) near-Earth asteroid that entered Earth’s atmosphere over Russia

and given the damage it caused, and the energy released, I don't think I'd want to be under 20 miles from its point of detonation should it have come in at a steep angle. Note that "Tunguska" has been recently re-analyzed (the object's own momentum included in the explosion's effects) to be in the 3-5 megaton range...

https://en.wikipedia.org/wiki/Tunguska_event

2009 WB105 is most likely considerably bigger than the impactor that created Meteor (Barringer) Crater in AZ. If it came in at a steep angle, a conservative estimate would be a resulting explosion of 40 megatons. If that is similarly directed as per the recent analysis of the Tunguska impactor... I think I'd want to be well over 50 miles away. If it makes it to the surface, I'm not sure how far fragments of Earth's crust might be tossed.

All that said, the likelihood of any human getting whacked by an asteroid is quite low. Then again, counting the really big ones, the risk may be greater than the risk of being killed by lightning.

https://news.nationalgeographic.com/2016/02/160209-meteorite-death-india-probability-odds/

My 1st question is, how sure is NASA that one of these objects trajectory will not be altered slightly by a collision with some other object too small to readily detect, while the "near Earth object is several days away. That is, perhaps "it will pass by Earth safely" should be modified to "it will almost certainly pass by Earth safely".

My 2nd question is, why do so many of these close passages seem to occur on weekends? Is it a little joke by the Creator?

Topics resulting from two searches (system only goes back about four years), "asteroid" and "asteroids":

How to Watch a Near-Earth Asteroid Zoom Closer to Earth than the Moon [11/09/2018 6:56:14 PM PST]
Nasa warning over trio of massive asteroids skimming Earth this weekend [11/08/2018 5:00:33 AM PST]
Rare blue asteroid responsible for Geminid meteor shower reveals itself during fly-by [10/24/2018 10:41:54 AM PDT]
NASA budget increases due to asteroid threat (Trump Exec Action 10/16/2018) [10/18/2018 11:23:33 AM PDT]
Japanese spacecraft drops observation device onto asteroid [10/03/2018 4:32:49 AM PDT]
Japan's Hopping Rovers Capture Amazing Views of Asteroid Ryugu (Video) [09/27/2018 12:59:04 PM PDT]
They Made It! Japan's Two Hopping Rovers Successfully Land on Asteroid Ryugu [09/22/2018 11:59:23 AM PDT]
They Made It! Japan's Two Hopping Rovers Successfully Land on Asteroid Ryugu [09/22/2018 7:10:44 AM PDT]
Japanese Probe Deploys Tiny Hopping Robots Toward Big Asteroid Ryugu [09/21/2018 6:22:21 AM PDT]
Asteroid the size of an office building to whip by us Saturday [09/06/2018 9:45:48 PM PDT]
Asteroid miners could use Earth's atmosphere to catch space rocks [08/29/2018 11:32:33 PM PDT]
How Old Is Asteroid Itokawa? Scientists Say They Finally Know [08/28/2018 12:30:05 PM PDT]
Skull-shaped asteroid RETURN: Massive space rock to fly by earth again this fall... [08/27/2018 8:16:21 AM PDT]
Asteroid Ryugu Poses Landing Risks for Japanese Mission [08/24/2018 3:16:27 PM PDT]
NASA forecasts asteroid bigger than a PYRAMID for '20,000mph close Earth approach' [08/22/2018 10:29:01 AM PDT]
NASA Spacecraft Begins Final Approach to Big Asteroid Bennu [08/21/2018 8:21:46 AM PDT]
Chasing asteroids: Dual missions sniff out clues to solar system's past [08/20/2018 10:28:19 AM PDT]
China Plans To Capture An Asteroid And Bring It Down To Earth [07/26/2018 3:52:43 PM PDT]
See the Dramatic Increase in Near-Earth Asteroids NASA Has Discovered (Video) [07/25/2018 2:14:03 AM PDT]
Reviewing Asteroid Day 2018 [07/20/2018 4:51:07 PM PDT]
Cosmic Double Take: Rare Binary Asteroid Discovered Near Earth [07/12/2018 7:32:34 PM PDT]
Two Asteroids Slipped Past Earth Undetected Last Weekend [07/12/2018 11:26:22 AM PDT]
NASA Spacecraft Refines Course Toward Big Asteroid Bennu [07/07/2018 3:18:41 PM PDT]
Asteroid Warning: Fragments which could wipe out Nations 'hidden in Taurids meteor shower' [07/06/2018 2:42:45 PM PDT]
Impact of asteroid that will approach Earth in 2029 'CANNOT be ruled out' [but pretty much no] [07/06/2018 1:50:43 PM PDT]
A Collision in Space 466 Million Years Ago Is Still Hurling Asteroids at Earth [07/05/2018 9:49:34 AM PDT]
Massive 4 Vesta Asteroid Is Zooming by Earth, and Here's How You Can Spot It [06/28/2018 8:04:51 PM PDT]
Ocasio-Cortez has an Asteroid named after her, here's why. [06/28/2018 12:27:34 PM PDT]
Interstellar asteroid update [guess]: It's a comet! [06/28/2018 10:33:05 AM PDT]
Japanese Sample Return Spacecraft Reaches Target Asteroid [06/27/2018 10:53:40 AM PDT]
A Japanese Probe Is Closing in on an Asteroid 180 Million Miles from Earth [06/26/2018 1:34:14 PM PDT]
An Asteroid Exploded Over Russia This Week And We Didn't See It Coming... Again [06/26/2018 9:02:58 AM PDT]
A Japanese Probe Is Closing in on an Asteroid 180 Million Miles from Earth [06/25/2018 8:14:11 PM PDT]
NASA now has an official plan for taking out asteroids [06/23/2018 1:13:15 PM PDT]
New asteroid gold rush 'could earn everyone on Earth £75 billion' [06/12/2018 10:14:02 AM PDT]
Tiny asteroid discovered Saturday disintegrates over Africa [06/04/2018 8:37:59 AM PDT]
'Lost' asteroid to pass closely May 15 [05/12/2018 8:06:33 PM PDT]
Incoming!: NASA says 5 'close' asteroid flybys will take place today [04/29/2018 7:11:26 AM PDT]
SURPRISE ASTEROID FLYBY [04/15/2018 5:30:02 PM PDT]
Pray for an asteroid [Dave Barry column on Taxes 1999] [04/13/2018 8:40:21 AM PDT]
Scientists Propose An Asteroid Nuke Mission To Save Earth From Potential Destruction [03/21/2018 10:47:49 AM PDT]
To Nuke an Asteroid, How Powerful a Bomb Do You Need? [03/14/2018 6:18:52 AM PDT]
Asteroid Bennu: Target of Sample Return Mission [03/13/2018 6:30:05 AM PDT]
Asteroids! WWIII! N. Korea! Military bunkers transformed into survivalist homes in S. Dakota [03/12/2018 6:14:57 PM PDT]
2017 VR12: Asteroid That Could Be Bigger Than Empire State Building Is About to Pass by Earth [03/02/2018 3:24:26 PM PST]
Two Asteroids Make Close Flybys of Earth [02/08/2018 9:39:35 AM PST]
Elon Musk's Tesla Roadster Is Headed to the Asteroid Belt [02/07/2018 4:54:26 PM PST]
CNN: Undetected Asteroids Could Threaten Earth During Government Shutdown [01/21/2018 10:36:18 PM PST]
CNN reporter: Shutdown risks asteroid strike! [01/21/2018 5:25:54 AM PST]
Giant 'Potentially Hazardous' Asteroid Will Whiz By Earth So Close We Can See Inside It [01/17/2018 9:22:59 PM PST]
Arecibo radar returns with asteroid phaethon images [12/23/2017 8:15:02 AM PST]
Haunted Again: Skull-Faced 'Halloween Asteroid' Returns in 2018 [12/21/2017 12:52:16 PM PST]
Asteroid that could've obliterated NYC skimmed past Earth - and NASA didn't notice [12/08/2017 9:25:30 AM PST]
The $10,000 quadrillion asteroid: Experts reveal how iron, nickel and gold makes 16-Psyche... [12/06/2017 5:44:13 AM PST]
Project Lyra, a Mission to Chase Down that Interstellar Asteroid [11/24/2017 9:23:07 AM PST]
Three-mile-wide Asteroid 3200 Phaethon to skim Earth just before Christmas Read more: [11/24/2017 6:01:48 AM PST]
ESO Observations Show First Interstellar Asteroid is Like Nothing Seen Before [11/20/2017 3:26:38 PM PST]
First interstellar asteroid is like nothing seen before [11/20/2017 10:52:40 AM PST]
Dinosaurs Might Have Survived the Asteroid, Had It Hit Almost Anywhere Else [11/09/2017 12:58:41 PM PST]
Good News Everyone! There are Fewer Deadly Undiscovered Asteroids than we Thought [10/21/2017 2:32:42 PM PDT]
Bus-sized Asteroid heading for Earth TODAY after string of near-miss encounters [10/20/2017 12:22:20 PM PDT]
Nope, our Temporary Moon Isn't Space Junk, it's an Asteroid [10/20/2017 12:12:40 PM PDT]
Earthlings test warning system as asteroid flies by [10/14/2017 1:45:15 PM PDT]
Asteroid that just buzzed Earth may not miss on return visit [10/13/2017 10:58:04 AM PDT]
House-sized asteroid will pass by Earth at just above satellite altitude [10/11/2017 7:26:47 PM PDT]
Close approach of asteroid 2012 TC4 poses no danger to Earth [10/10/2017 8:13:24 PM PDT]
NASA Is Testing Its Asteroid Defense System With a Real Asteroid [10/05/2017 8:16:53 PM PDT]
Asteroid the size of a HOUSE to skim past Earth at one-eighth the distance of the Moon [10/02/2017 10:06:26 AM PDT]
Scientists Urge Europe to Stick With "Armageddon"-style Asteroid Mission [09/25/2017 10:30:59 AM PDT]
Asteroid Odd Couple: Spitting Space-Rock Duo Is Truly Bizarre [09/20/2017 1:36:11 PM PDT]
New theory on origin of the asteroid belt [09/14/2017 11:41:53 AM PDT]
Asteroid Florence has two moons [09/06/2017 6:56:18 PM PDT]
Watch Asteroid 3122 Florence Zip Past Earth This Weekend [08/30/2017 8:21:40 AM PDT]
Nearly 3-mile wide asteroid to pass close by Earth Sept. 1 [08/30/2017 6:17:25 AM PDT]
A THREE MILE wide asteroid is set to graze past Earth on Sept. 1 - and NASA says it's the largest [08/18/2017 4:14:12 PM PDT]
Impending Asteroid Flyby Will be a Chance to Test NASA's Planetary Defense Network! [08/01/2017 4:18:27 PM PDT]
A plane-size asteroid buzzes by Earth undetected [07/27/2017 10:37:31 AM PDT]
NASA unveils plan to test asteroid defense technique [07/01/2017 5:39:58 PM PDT]
Are asteroids humanity's 'greatest challenge'? [06/28/2017 5:51:02 AM PDT]
Live long and prosper: Learn about Asteroid Day [06/25/2017 6:50:35 AM PDT]
ASTEROID WARNING: NASA discovers TEN 'potentially hazardous' rocks close to Earth [06/11/2017 6:50:35 PM PDT]
Earth Faces an Increased Risk of Being Hit by an Asteroid, Astronomers Warn [06/07/2017 6:04:32 AM PDT]
NASA Moves Up Launch of Psyche Mission to a Metal Asteroid [05/25/2017 5:08:43 PM PDT]
Asteroid worth $10,000 quadrillion 'could transform global economy [05/25/2017 10:52:57 AM PDT]
Newly Discovered House-Sized Asteroid 2017 HX4 Flew Safely Past the Earth Yesterday [05/10/2017 7:53:58 AM PDT]
Big Asteroid Is Heading Close to Earth [04/09/2017 9:07:21 PM PDT]
Asteroid to Fly Safely Past Earth on April 19 (Asteroid 2014 JO25, Diameter = 2,000 feet) [04/07/2017 1:13:54 AM PDT]
Phew! Asteroid the size of a BUS came closer to the Earth than the moon last night [03/31/2017 9:59:45 AM PDT]
Wrong-Way, Daredevil Asteroid Plays 'Chicken' with Jupiter [03/30/2017 8:13:58 AM PDT]
..hang a wandering skyscraper from asteroid orbiting Earth [03/29/2017 4:36:58 AM PDT]
That really IS a high rise: Sci-fi plan to hang wandering skyscraper from asteroid orbiting Earth... [03/28/2017 7:40:18 AM PDT]
Asteroid passed unusually close to Earth last week [03/05/2017 8:03:05 PM PST]
Meet Asteroid 2017 BQ6 -- A Giant, Spinning Brick [02/14/2017 11:26:54 AM PST]
NASA's Asteroid-Hunting Spacecraft Just Got an Amazing Side-Quest [02/04/2017 4:20:04 PM PST]
Asteroid 2017 BS32 will zoom past Earth TONIGHT in fourth close shave of the year [02/02/2017 8:30:40 AM PST]
Asteroid whizzing by Earth six times closer than the moon [01/31/2017 8:32:27 AM PST]
Is asteroid due to crash into Earth sparking mass tsunamis NEXT WEEK? [01/27/2017 12:43:37 PM PST]
Fallout from an ancient asteroid collision still rains on Earth [01/24/2017 10:16:26 PM PST]
A Sneaky Asteroid Buzzed By Earth Yesterday [01/11/2017 10:29:01 AM PST]
Sneaky asteroid spotted whizzing between Earth and moon [01/10/2017 12:28:09 PM PST]
NASA says mysterious object hurtling towards Earth could be an asteroid or a comet [01/04/2017 2:50:43 PM PST]
NASA says mysterious object hurtling towards Earth could be an asteroid or a comet [01/04/2017 6:39:03 AM PST]
NASA Says We May Have to Nuke Killer Asteroids: A nuke might be the only way to save ourselves [12/15/2016 11:08:50 AM PST]
Preparing For An Asteroid Impact? UN Proclaims June 30 As International Asteroid Day [12/07/2016 8:49:27 PM PST]
6-Foot-Wide 'Bald' Asteroid Is Smallest Ever Studied [12/02/2016 5:16:10 PM PST]
Asteroid strike made 'instant Himalayas' [11/18/2016 9:20:25 PM PST]
Rock Legends - the Asteroids and Their Discoverers [11/10/2016 7:48:39 PM PST]
Incoming! How NASA and FEMA Would Respond to an Asteroid Threat [11/05/2016 12:55:29 PM PDT]
Watch Asteroid 2016 VA Pass Through Earth's Shadow [11/02/2016 7:56:36 AM PDT]
Pure Metal Asteroid Has Mysterious Water Deposits [11/01/2016 8:48:06 PM PDT]
NASA's New 'Intruder Alert' System Spots An Incoming Asteroid [10/30/2016 9:41:54 AM PDT]
NASA provides update on Asteroid Redirect Mission [09/19/2016 6:21:34 PM PDT]
OSIRIS-REx Blasts off on 7 Year Sampling Trek to Asteroid Bennu and Back [09/10/2016 9:05:45 AM PDT]
NASA launching spacecraft to intercept asteroid [09/08/2016 11:59:09 AM PDT]
NASA asteroid probe may find clues to origins of life on Earth (Bennu, time capsule of our origins) [09/08/2016 11:57:51 AM PDT]
Large asteroid will come TEN times nearer to Earth than the moon today (edited) [09/07/2016 9:20:31 AM PDT]
Freddie Mercury Receives Namesake Asteroid on 70th Birthday [09/05/2016 5:39:45 PM PDT]
Earth just had a 'close shave' with a 180ft asteroid - and no one saw it coming [09/01/2016 7:47:03 AM PDT]
Earth Just Narrowly Missed Getting Hit by an Asteroid [08/30/2016 4:20:38 PM PDT]
NASA plans to launch study of asteroid that could destroy Earth (Bennu in 2135 scenario) [07/31/2016 3:51:23 PM PDT]
Vast asteroid created 'Man in Moon's eye' crater [07/20/2016 5:42:28 PM PDT]
Warming pulses in ancient climate record link volcanoes, asteroid impact and dinosaur-killing... [07/05/2016 12:04:27 PM PDT]
The asteroid that killed the dinosaurs almost got us, too [06/29/2016 10:26:05 PM PDT]
Asteroid Day 2016 Is June 30 [06/29/2016 8:57:55 PM PDT]
Plan to Turn Asteroids Into Spaceships Could Spur Off-Earth Mining [06/07/2016 6:58:07 AM PDT]
What was that?! NASA says asteroid entered atmosphere over Arizona (VIDEO) [06/02/2016 4:16:37 PM PDT]
Asteroids 'dumped water into molten Moon' [05/31/2016 4:24:11 PM PDT]
Clues to ancient giant asteroid found in Australia [05/16/2016 8:53:57 AM PDT]
'Trickle of food' helped deep sea creatures survive asteroid strike that wiped out the dinosaurs [04/25/2016 9:28:28 PM PDT]
Hewitt: Doubtful that Trump reaches 1,237 delegates, unless a 'political asteroid' hits California [04/24/2016 5:56:23 PM PDT]
Dinosaurs 'already in decline' before asteroid apocalypse [04/18/2016 2:00:44 PM PDT]
Planetary Resources Development Corp. Awarded U.S. Patent No. 9,266,627 for Asteroid Mining Process [03/25/2016 7:06:58 AM PDT]
We Finally Know How Much the Dino-Killing Asteroid Reshaped Earth [03/22/2016 10:32:51 AM PDT]
LIVE: Asteroid "B2Bomber" approaches close to Earth (webcast to begin at 12am EST) [03/09/2016 11:57:40 AM PST]
Scientists develop mini Death Star to protect us from asteroids [03/03/2016 4:50:09 PM PST]
Asteroid set to whiz past Earth next week [03/03/2016 4:47:29 PM PST]
The asteroid of 'uncertain orbit' that REALLY could smash into Earth, according to NASA [02/29/2016 6:53:00 PM PST]
Vanity: Excuse me ? 30 meter asteroid within .1 lunar distance ? [02/20/2016 9:05:26 PM PST]
Asteroid TX68 is approaching! [02/17/2016 2:03:07 AM PST]
Medium-Size Asteroid Strike Could [Depending on Where It Strikes] ]Unleash a Mini Ice Age [02/09/2016 11:59:06 AM PST]
NASA Says â€œNo Chanceâ€? Small Asteroid Will Hit Earth On March 5th [02/06/2016 10:53:52 AM PST]
100-Foot Asteroid to Buzz Earth Next Month [02/06/2016 2:42:17 AM PST]
2003 SD220: Asteroid to flyby Earth on Christmas Eve in first of five encounters [12/17/2015 12:46:11 PM PST]
Massive asteroid will pass Earth on Christmas Eve (but donâ€™t worry.... [12/16/2015 8:03:08 PM PST]
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Photographer Caught Stunning Meteor Instead of Spooky Asteroid [11/08/2015 7:45:00 PM PST]
Large 'Spooky' Asteroid to Narrowly Miss Earth on Halloween [10/20/2015 6:36:56 PM PDT]
Scientists to see if they can save planet from asteroid [10/04/2015 1:20:59 AM PDT]
Tracking a mysterious group of asteroid outcasts [08/05/2015 3:09:35 PM PDT]
Asteroid worth £3 TRILLION in precious metals set to pass Earth on Sunday [07/17/2015 1:58:36 PM PDT]
NASA Asteroid Redirect Mission on the brink of cancellation [06/30/2015 11:55:03 AM PDT]
Asteroid Day Takes Aim at Our Cosmic Blind Spot: Threats From Above [06/30/2015 5:08:46 AM PDT]
Astronomy Picture of the Day -- An Unusual Mountain on Asteroid Ceres [06/29/2015 9:49:58 PM PDT]
NASA May Use Nukes To Defend Earth From Asteroids [06/22/2015 12:28:27 PM PDT]
How NASA Will Save the World from Giant, Killer Asteroids [06/19/2015 5:00:23 AM PDT]
Asteroid a MILE wide to hurtle past Earth in 48 HOURS - as experts warn of MASS EXTINCTION [05/12/2015 7:08:14 AM PDT]
Did Dinosaur-Killing Asteroid Trigger Largest Lava Flows on Earth? [05/11/2015 1:22:51 PM PDT]
Astronomy Picture of the Day -- Vesta Trek: A Digital Model of Asteroid Vesta [04/21/2015 5:23:54 AM PDT]
Close Encounter of the Asteroid Kind - 2015 HD1 Skims By Earth Tonight [04/20/2015 8:55:50 AM PDT]
Origins of Russian fireball found: Scientists say... [similar orbit to asteroid 2014 UR116] [04/09/2015 10:36:05 AM PDT]
OSIRIS-REx Asteroid Sampler Enters Final Assembly [04/01/2015 3:49:19 PM PDT]
NASA selects 'Option B' for Asteroid Redirect Mission [03/28/2015 12:32:23 PM PDT]
No, a Giant Asteroid Isn't Going to "Skim" Earth on Friday [03/26/2015 1:27:16 PM PDT]
World's largest asteroid impacts found in central Australia [03/23/2015 5:53:18 PM PDT]
Asteroid-Comet Hybrid Found With Surprise Ring System [03/17/2015 8:58:18 AM PDT]
This Is The Asteroid That Didn't Hit Us [03/13/2015 12:51:46 PM PDT]
Astronomy Picture of the Day -- Dark Craters and Bright Spots Revealed on Asteroid Ceres [02/19/2015 5:22:59 AM PST]
The Number of Asteroids We Could Visit and Explore Has Just Doubled [02/11/2015 2:12:18 PM PST]
Closest Images Asteroid P/2010-A2 Vincenzo Giovanni Ruello [02/04/2015 8:40:21 AM PST]
Awesome New Radar Images of Asteroid 2004 BL86 [01/31/2015 10:57:15 AM PST]
What Asteroid 2004 BL86 and Hawaii Have in Common [01/29/2015 1:36:58 PM PST]
News Flash: Asteroid Flying Past Earth Today Has Mini-Moon! [01/26/2015 6:34:33 PM PST]
How close a huge asteroid just came to Earth and how to see it [01/26/2015 2:53:31 PM PST]
Astronomy Picture of the Day -- Approaching Asteroid Ceres [01/20/2015 5:55:25 AM PST]
Big Asteroid 2004 BL86 Buzzes Earth on January 26: How to See it in Your Telescope [01/15/2015 3:32:05 PM PST]
Asteroids Don't Break Up Like You Think They Do: Study [12/31/2014 8:54:32 AM PST]
The Trillion Dollar Market: Fuel in Space from Asteroids [12/11/2014 11:56:21 PM PST]
Fear Not: Quarter-Mile Asteroid Is No Threat To Earth, NASA Says [12/09/2014 4:18:56 PM PST]
Bigger than Apophis: Dangerous 300+ meter asteroid to cross Earth orbit every 3 years [12/08/2014 10:42:03 AM PST]
Dawn Spacecraft Will Take Pictures Of Its Target Asteroid Today [12/01/2014 8:55:31 AM PST]
The Whichness of the Why -- Another asteroid has been detected sporting a long tail. [11/22/2014 12:31:05 AM PST]
Asteroid Mining: Not as Crazy as it Sounds [11/21/2014 7:54:43 PM PST]
What is the Difference Between Asteroids and Comets? [11/19/2014 1:44:17 PM PST]
Building A Space Base, Part 1: Why Mine On The Moon Or An Asteroid? [11/03/2014 2:26:13 PM PST]
Real space battles would be more 'Asteroids' than 'Star Wars' [09/29/2014 11:44:33 AM PDT]
NASA's Watchdog Office Criticizes Asteroid-Hunting Program [09/15/2014 3:41:55 PM PDT]
An asteroid will just miss Earth today. We won't always be so lucky [09/07/2014 5:37:19 AM PDT]
Asteroid will zoom within 25,000 miles of Earth [09/04/2014 11:39:06 AM PDT]

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How to Watch a Near-Earth Asteroid Zoom Closer to Earth than the Moon