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It maybe tough to appreciate a zoomer's skill((6,7)

Not hard to figure that iceberg will hit - it’s physics! (3,3,6,7)

Mash-up of hits by Elton John* and Thomas Dolby**, popular at JPL***? (6,7)

*Rocket Man
**She Blinded Me with Science
***Jet Propulsion laboratory, NASA/Caltech

Sorry, absurdly contrived but the topic reminded me of T. Dolby, whose interesting book The Speed of Sound I read a few years ago. And I liked the tune.

Frontiersman had no limits to his education - hard to understand (6,7)

(C)rocket(t)

Knowing how to get your kit off in stages, stay up for a while, make a final entry, and create a big splash (6,7)

[ Mathprof@10, I think so, the Julian calendar which would have been used in 512 had the same system of leap years, but I’m happy to be corrected if I got that wrong ;-) ]

Could be the botanical study of salad leaves is difficult to learn (6,7)

It’s very straightforward … computer group with knowledge of the world accepts no dealings in Aberdeen (3,3,6,7)

[TROCK … Scottish alt. of TRUCK, meaning ‘dealings’]

Slight tweak to #18 …

It’s very straightforward … computer group with knowledge of the world accepts no trade north of the border (3,3,6,7)

V = IR, easy? (3,3,6,7)

Was going to use
m1v1 = m2v2 but it doesn't look right