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Lindley Johnson says just crossed the 20,000 threshold of number of near Earth asteroids discovered to date (20,001 total as of Friday); includes 8,574 greater than 140 meters across and 897 greater than 1 km cross.
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6 years ago, 1500 people were injured in Chelyabinsk. Next time could be worse. Let's do something about it.
#HeraMission#PlanetaryDefense pic.twitter.com/ELxkQkQzv4 -
#WasJustAnOrdinaryDay until some uninformed Twitter accounts took an asteroid scare seriously@esaoperations@nasa#Asteroid#2019PDC#PlanetaryDefense http://ow.ly/qKgg30oyHqwPrikaži ovu nit -
It’s 2028, and ESA has been carefully monitoring a worrying situation: an enormous asteroid is en route to strike Earth, although the exact point of impact is not yet clear... To find out what happens next in this
#FICTIONALEVENT, follow@esaoperations#PlanetaryDefense pic.twitter.com/K6OxzOOr4RFictional asteroid impact eventIt’s 2028, and ESA has been carefully monitoring a worrying situation: an enormous asteroid is en route to strike Earth... -
LIVE NOW: For 20+ years, we and our partners have scanned the skies for asteroids + comets that orbit the Sun and come within 30 million miles of Earth’s orbit to keep Earth safe. Hear the latest about
#PlanetaryDefense from@JimBridenstine:https://twitter.com/JimBridenstine/status/1122852893625847813 … -
LIVE: Speaking at the
#PlanetaryDefense Conference https://twitter.com/i/broadcasts/1LyxBAzPoRnJN … -
#PlanetaryDefense Conference: Day Four
On the penultimate day of the conference, talks are focussed on the consequences of asteroid impact and disaster management, as well as issues affecting decision making and public communication.
Stay tuned! pic.twitter.com/eZpDWb3y2s
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Okay, Physics Twitter.
@chelswhyte and I have a question. If we were to place a continent-sized gong just above LEO, and a 50-km asteroid hit it, would the sound kill people and/or cause mass destruction on Earth?#PlanetaryDefense#TheGong -
Time to reach the general public: "
#Asteroids threaten or resources?" To talk about#PlanetaryDefense and#asteroidmining@Stardust_H2020#HeraMissionpic.twitter.com/FyM8cQlihP
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Final update on
#FICTIONALEVENT: 19 April 2027 The 60-m fragment of fictional asteroid#2019PDC is predicted with certainty to impact over the Central Park area in New York City, 10 days from now#ExerciseOnly!!#PlanetaryDefense
pic.twitter.com/g7AcucI9WE
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Are you following the fascinating
#PlanetaryDefense thread over on@esaoperations?
OK, so what's an 'NEA'? An important term often used in conversations about #PlanetaryDefence – but what does it mean? Find out here
https://www.esa.int/spaceinvideos/Videos/2018/06/What_is_a_near-Earth_asteroid …pic.twitter.com/PDbzwZbRZD -
Check out the
#PlanetaryDefense hashtag this week as our partners at@NASA and other experts from around the world participate in an exercise simulating a hypothetical scenario of an asteroid impacting Earth.
https://twitter.com/NASA/status/1122845347951280128 …
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What would you do if you found out an asteroid is about to impact the Earth? Last week, scientists had an asteroid impact drill to prepare for such a situation. My youtube video this week explains it all
#HERA#SPACE19#PlanetaryDefense https://youtu.be/tWfhxY7D_70 -
LAST CHANCE for the free shipping offer with discount code 'ASTEROIDIMPACT' – get your dino T-shirt and other
#PlanetaryDefense items before tonight https://www.esa.int/esashop pic.twitter.com/uO67msAjdf -
At 14:00 CEST (08:00 EDT) today, we will be LIVE on Facebook once more from the
#PlanetaryDefense Conference. Join a host of experts from NASA, ESA & the UN to discuss the#fictionalevent playing out and what we can learn from it. Question? Ask below!
http://www.facebook.com/esa pic.twitter.com/b3xVg6iKgX -
@NASA’s first#PlanetaryDefense mission:#DART, implemented right here at@JHUAPL. What happens on impact? Everyone has some opinions. One test is worth one thousand opinions. We will test how we can deflect an asteroid if we ever need to save our planet.https://twitter.com/JHUAPL/status/1123647718356922369 …
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We‘ve been proudly producing
#AsteroidDayTV for the@UN World@AsteroidDay since 2017. In partnership with@SES_Satellites &@BCE_Lux /@rtlgroup. The only TV channel dedicated 100% to#space &#planetarydefense.#AsteroidDayLIVE hosted by@ProfBrianCox in 2018.
by @MaxA_Photopic.twitter.com/NKZQUAKqFc
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Competition!

Answer the following question with hashtag #ESAquiz for a chance to win a#PlanetaryDefense t-shirt, tote bag or drawstring bag.
ESA's #HeraMission will study the#Didymos asteroids for#PlanetaryDefense. How many cubesats will it bring with it? pic.twitter.com/E6t0g34A60
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This week, as part of the
#PlanetaryDefense conference,@NASA and other agencies are participating in a hypothetical asteroid risk exercise. This is an#ExerciseOnly. Information about the simulated asteroid "threat" is at https://go.nasa.gov/2GTzJAk .Prikaži ovu nit -
Go for Didymoon! ESA's
#asteroid#HeraMission for#PlanetaryDefense has been approved by Europe's space ministers at#Space19plus. The spacecraft will be Europe's contribution to the international#AIDA4Asteroids endeavour, teamed with@NASA's DART mission http://www.esa.int/hera pic.twitter.com/PBBBurDRM1
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Fire drill
Asteroid drill
We like to be prepared. While Earth is safe from all known asteroids, this week we're joining our partners to practice what to do if in a different situation. Follow this
Telescopes on Earth will measure the change in the orbit of Didymos B to evaluate the effectiveness of the impact.